I'm not saying he can't be that. I just feel more comfortable after watching him develop this season, based on what he's shown, saying he should be the #2 option a contender once he develops some more. I'm not as comfortable calling him a true franchise player yet or seeing him as a guy who could lead his team to contention. It wouldn't surprise me that much if he became that but before declaring him to be that good I'll wait until he gets some more playing time with quality players on the court with him and seeing how he does. He could be a future MVP, it's definitely possible, but before anointing him as that I'd like to see him make an All-Star team and play in the postseason.
If I had to compare his future to anyones I'd compare it to Amare's, pre-microfracture and Nash returning to Phoenix. The sky is the limit for him, he's got all of the tools to be scary good in the future but I think it will take him being paired with another really good-great player before he's really capable of reaching his potential. Whether he ends up being the primary scorer, like Amare was, or the leader of the team who everyone benefits from playing with, like Nash was, his future is definitely bright.