He's already more over and he's not even here. Might as well capitalise on it and put him in a programme with someone else as a distraction. Hell, send him to NXT if he's pissed off about it. It's a net gain.
Bryan being active and not in the main event will cause fans to start booing Roman again though, just like what happened to Batista and Roman last year. Vince doesn't want his pet project Roman Reigns getting booed at WrestleMania again.