I'd definitely like to see Bully Ray get a run with the World Championship. His post Team 3D heel turn has been phenomenal. He is in the best shape of his life, and it shows in the ring. His in ring work has been crisper, and he actually stands out as a singles competitor, unlike Devon, who has no identity outside of Team 3D.
Bully Ray was really the enhancement talent that helped get Bobby Roode over as a heel champion. Without Ray, Roode would not have gotten the heat he did earlier in his heel turn. I think Ray has become the best heel in wrestling today, basically re-introducing his heel persona from the ECW days. For his work in helping get Roode over alone, and helping to put over some of TNA's top names, I'd say he has earned a title run.
It is hard to say how long his current run will last, he seems to be healthy, and capable of going for quite a few more years, but whether or not he wants to is another story. If he were to ever go to another promotion, he'd never get the chance to shine as a singles heel the way TNA is letting him, and I think he knows that too. I'd like to see a nice, long program that built towards a title run, with either Storm or Hardy as the man he takes the title from.
Here's hoping TNA gives the guy a shot, he's earned it. If it doesn't work out, it's not like TNA has ever had a problem hot shotting the title on to someone else