James was a different era than Jordan. Jordan got the luxury of 6 expansion teams watering down the league during his hey day. Jordan was a different era than Magic/Bird. Magic/Bird was a different era than Wilt thanks to the addition of the 3 point line in 79-80 and the addition of the blocked shots stat that would have shown Wilt to have been even more dominant than he gets credited for.
He was dominant and would have been great no matter when he played, but he also played in an era where a 7-footer was pretty rare, and a really talented one was even rarer. And the shorter guys that would get matched up against him today are much more athletic than the shorter guys he matched up against back then.