I'm not even knocking wiggins at all, but let history be your guide.
There's very little doubt that wiggins will be a good / very good player. He kind of already is good now.
But you hardly ever see someone with an assist percentage as low as his end up as a "superstar" or anything like that. Someone who has the ball as much as he does should be able to playmake better than he has done thus far through his young career.
Is he young? Yes. But there's nothing to suggest that's going to all of a sudden make a huge jump as far as playmaking for others and shooting the 3 ball at a semi efficent clip. These things are independent of youth so "how we judge 19-20 year olds" really is irrelevant for the sake of this discussion with wiggins. He may become marginally better at these things, and become a rudy gay or a demar type player, and that's fine.