He has all the talent in the world. So technically speaking if he can use that talent, and potential, and do with it what it appears he can do then yeah he could in theory make it.
It's far to early to have any idea of whether that will happen or not and he's got a long, long, long road ahead of him to do so. As many have already noted it's going to be tough to get in at WR for a long time at this point. Hell Andre Reed and Tim Brown aren't in yet and they both had amazing careers. Then you're going to have guys coming up like Marvin Harrison, Issac Bruce, Tory Holt, TO, Randy Moss, and that's just the people that will be coming up to add to those two prior. Then when you add in the guys that will likely be eligible by the time Dez could even think about this honor you're going to be adding guys like Larry Fitzgerald, Andre Johnson, Megatron, to that list as well.
Since they're likely only to take 1 a year when they do take WR's, if they even take 1 per year, that's 10 names, at least, who will be fighting to get in, many of which will still likely be trying to get in by the time Dez could.
So many things that could happen that this is very hard to even speculate, with any sort of accuracy, at this point.