It's possible, but I think the depth of this year's draft hurts him. He's currently listed as the last pick of the first round in a number of 2015 mock drafts. It depends on who declares this year, but assuming all the top players do (there are rumors that Jabari and the big kid from Kansas might stick around) I think he's a fringe first rounder.
Yeah, I've seen that too. I think he's undervalued now and that his stock would rise as more and more scouts look at him closely. When I look at other late first/early second round players, I have to think he would end up ahead after the scouting/workout season.
Plus, he is "old" for the NBA draft, so that might make him want to take his chances now.
Of course, I hope he stays.