However, based on track record, what we know about this year's Wrestlemania and what we can safely presume about the plans for it, the main event booked for the upcoming Fast Lane show of Dean Ambrose Vs Brock Lesnar Vs Roman Reigns with the winner challenging Triple H for the WWE Championship at Wrestlemania seems like a straight up bad idea.
Let's get this out of the way; Roman Reigns is winning. You can clutch your Ambrose dreams to your chest all you want...or your Lesnar dreams if you seriously want to see Brock Vs Triple H again for some reason, but it's a safe bet Triple H Vs Roman has been the plan for a while. WWE wanted last year's Wrestlemania to be Reigns' breakout moment, that was derailed by the Royal Rumble 2015 trainwreck, they're not going to sideline him this year to pander to the Ambrose crowd. WWE have been teasing Reigns Vs Triple H since last Spring, it could be argued this feud began the day after Wrestlemania 30! The match is happening and it'll probably be more painless to accept that now rather than mentally masturbating about potential alternatives for the next few weeks.
Right now the presumed Wrestlemania card is Roman Reigns Vs Triple H, Brock Lesnar Vs Bray Wyatt and Dean Ambrose Vs The Inevitable Sidelining of Popular Midcard Talent That Part-Timer Main Eventers Force Upon The Wrestlemania Card Every Year. Think about what would happen if that was shuffled around, if you do Ambrose Vs Triple H then who does that leave for Reigns, the guy who's been pushed as a MEGA star all year so needs a big match? Bray? We've seen it a million times this year. Brock? If that's the case then the triple threat at Fast Lane makes even less sense because why wouldn't you just save it? Undertaker? ARE YOU SERIOUS, that puts Reigns in the worst position imaginable! And even if it was a good idea I doubt they would trust him with Sting after the Rollins match.
Factoring in the fact The Rock is going to be at Wrestlemania and it doesn't seem like he has any intention of wrestling a match...yea, unless something goes horrifically wrong with WWE's plans in the next few weeks Roman Reigns Vs Triple H is happening (although, if Undertaker is indeed retiring this year it might not necessarily be the main event).
So with that in mind, what's wrong with the triple threat they've booked for Fast Lane? Even with Roman starting to get decent reactions from WWE crowds in recent months there's obviously also a large portion of the fanbase who can't stand the guy and have no interest in seeing him win the WWE Championship again from a 46 year old man at Wrestlemania. Those people are going to be in the corner of Ambrose or Brock, and regardless of who wins this match and how a significant portion of the audience is going to be extremely disappointed with the result of the main event of the Pay-Per-View that only exists to get people excited for Wrestlemania.
The worst thing about WWE booking lately is they keep putting themselves in situations where they can only do one thing (even if it's a "swerve") so everyone both predicts and groans at it when it happens. Regardless of your opinion of it, Sheamus pretty much had to cash in at Survivor Series because there was no other option that wouldn't throw a big wrench in WWE's plan, Triple H HAD to win the Royal Rumble because they put themselves in a situation where they needed the title off Reigns and onto someone he could challenge at Wrestlemania. Following last year's horrendously put together Royal Rumble WWE had to book an awkward face vs face match between Daniel Bryan and Roman Reigns, which of course meant Reigns had to beat the most popular guy in the company going into Wrestlemania 31 which did him no favours with his detractors.
The frustrating thing about the Fast Lane match is there's absolutely no reason for it, it's three guys different parts of the crowd all love and one of them has to get heat by knocking the other two of the Wrestlemania title match. There's no reason why this match couldn't have been Ambrose Vs Reigns Vs Sheamus Vs Rusev with the other League of Nations members screwing Ambrose and giving Reigns some odds (and some HEELS god forbid) to overcome heading into his big match against Triple H. At least that would also give Ambrose something to work with heading into his own Wrestlemania match. Instead, what we're probably going to get is the Wyatt Family beating down Brock Lesnar, and then creative have to decide if they want Reigns to pin a guy who's been beat down by four other guys or beat his friend clean (again). I can't imagine either scenario getting anything other than a tepid reaction...or boos.
The match itself will probably be a ton of fun, maybe Dean Ambrose will get the Intercontinental title taken off him to try and increase the odds of him winning, maybe I'm completely wrong and WWE has some plans for an unconsidered match that somehow involves Ambrose and Reigns. Maybe Ambrose will turn heel with timing that makes much less sense than it would of at Survivor Series! I strongly doubt it though, WWE will go with their original plans, which I presume they have none as far as Ambrose is concerned right now, and they will hope having a cool match on Fast Lane will get fans pumped for Wrestlemania.
I would advise against getting your hopes up here, but the problem is the existence of this match at all creates possibilities in your mind that WWE don't want you to consider right now. Basically, they've created a match that's only going to cause you to be disappointed that stuff that you know probably won't happen didn't happen, shooting themselves in the foot in the process.
But hey! WWE screwed all this stuff up during the build of the last two Wrestlemanias as well and they turned out alright, so who even cares.