This is a little ridiculous. All these named moves are just relatively common moves that got named because a certain player was really good at them. For instance, every player in the NBA has a "Jordan Turnaround," but no one is as good at it as Jordan was.
It's like saying "Are the Celts in trouble if Kobe learns Allen Iverson's crossover from 1998-2002?" Ummm...yes, if Kobe was suddenly as fast and quick off the dribble as AI was back then, everyone would be in trouble. But he never will be. AI's signature crossover was just a crossover done by AI. The Dream Shake is just post moves and fakes done by Hakeem. So no, it doesn't matter if Kobe learns something called the "Dream Shake." It's just a matter of guarding Kobe's post moves, which many other 2/3's are strong and fast enough to do. The problem with Hakeem was he was KG-fast, but bigger, so no one could guard him, whatever moves he did and whatever they were called.