Anywaaaaay, in a perfect world, Reigns beats Lesnar at Wrestlemania due to Paul Heyman interference on his end and turns heel in the process. In doing so, Reigns and Heyman align with The Authority. Rollins slowly starts to get etched out by the whole Authority because they now believe Roman Reigns is the future and he is not. Weeks/months pass and Rollins is absolutely sick of playing second fiddle to a heel Reigns and finally decides to cash in his Money In The Bank at the Money In The Bank PPV against Reigns. He requests the match weeks before, and doesn't try to sneak up and cash in. MITB comes around and lets say Ambrose wins the MITB contract. After that match, the main event goes on and Reigns beats Rollins with a little bit of help from Paul Heyman. The next night on Raw, The Authority beats Rollins down ala Randy Orton getting beat down by Evolution and thus begins his massive face turn as the fans feel for him. He spends the next few months feuding with The Authority (Kane/Big Show/maybe a wildcard joins like Sheamus or Harper) and he beats them all ultimately leading to a match a Survivor Series with Triple H which he wins. At TLC, he is put in a tag team ladder match with some faces(Rollins/Bryan/Ziggler) vs (Show/Kane/Sheamus) with the stipulation that if his team wins, The Authority go away FOR GOOD. The face team wins and The Authority(HHH & Steph) are sent packing. Through some fckery, Paul Heyman is now the GM of Raw. 2016 rolls around and so does the Royal Rumble. Heyman makes Rollins earn his spot in the Royal Rumble in a handicap match against Kane and Sheamus (Show turns face because Show always turns lol) and Show helps Seth win. Heyman says Seth has his place in the Rumble, but he's going in at #1. Seth enters the Royal Rumble at #1 and ends up winning it all. He is set in a filler Fast Lane feud that if he loses then he has to relinquish his Wrestlemania spot to Kevin Owens(big bad dude from NXT, we will say he debuted mid 2014 and was wrecking everyone). Seth wins the match by DQ as Owens goes on a relentless assault after Rollins was close to victory. Paul's plan to weaken Rollins seemed to have worked. All this time, Roman has been defending his title successfully so we are looking at the ultimate showdown: Heel Reigns vs Face Rollins. Rollins beats Reigns and has his Wrestlemania moment.........and the Ambrose cashes in, wins the title, and they go on to feud for months like last year but with their roles reversed. Seth Rollins ultimately wins the title back at SummerSlam and that's as far as I'll go haha.
I got a little carried away here and it has a little fat that needs to be trimmed but damnit I would love for this to happen.