There is a reason they are not on TV and others are. They had their chance and really didn't get over. It is as simple as that. They are not the money makers they are looking for. I mean you toss D Bryan and Kane together and the PTPs and you have better merchandising with them than you ever had with the USOs
i like the Uso's, they're fun to watch and have good energy, i have to wonder if they are being held back because of Rikishi's run with TNA.. dunno
I'm sure they're a nice couple of guys, but I've found every single aspect of their game to be thoroughly unremarkable. I honestly don't see them going on to accomplish much of anything of value in whatever's left of their WWE run.
A gimmick involving them intentionally packing on more weight as a means of honoring their heritage could be fun, though. I could actually see fans taking delight in them embracing letting themselves go. Like, they could get winded half-way through their battle-dance and just quit to double-fist bacon cheeseburgers instead. Fellow slobs and lard-asses would (here come the puns!) eat that shit up.