Since he already proved that he can bring a regular NBA team into the Championship, I don't think that he will go to the super team where he does not need to work so hard as he did a few days ago to win another championship. If he stays in the Milwaukee Bucks, that would be a good decision too since he already established great chemistry with his team and the franchise, and also their fans really like him.
This accomplishment is destined to be in him. Not to take the credit away from him but what if Harden and Irving of the Nets were not injured during that time? He may not reach the Finals I think. So with him holding that Larry O'Brien trophy makes his stock goes up and he kept wanting more but I doubt the Bucks can defend the title next year if the Nets are healthy so with that said, if there is an opportunity that he can move to a super team, I think he will do it. Just my two cents.