If Bryan wins (are all indications that he will? He has to, right?) a unification program with whomever the US Champ is could be great. Reigns is likely going to be struggling on top, and saddling him with Big Show does him no favors, but at least a potential Cena or Rusev vs Bryan program underneath would make for a match to get excited for.
I doubt that the belt would stay "elevated" for long, but it's something. I have heard others say this, as well, but if it's me and I am dead-set on pushing Reigns as hard as I can, Rusev beats Cena and turns Bryan into a puddle of goo before the beast killer Roman Reigns dispatches of another monster. We'd all hate it, of course, and I don't envision it happening. More likely, Reigns wins at Mania with a poor reaction, the Show feud dies a death, they half-ass his push and he winds up just another guy before 2016.