Well yes.
For now, it's a volume thing.
Players have shot at those percentages before, but never with as much volume as Curry.
In a way, this is sort of a test. If Curry can continue to be this effective at this high a volume, it's going to cause more teams/players to do the same.
In that sense (and I really, really hesitate to make this comparison), it's sort of like a Babe Ruth effect -- from the perspective that, everyone thought it was foolish to try and hit home runs...until Ruth proved he could do it way more often than people thought possible. It seems that we all think shooting a lot of 3 pointers is foolish...but Curry is proving (for now) that it can be done more successfully than thought possible.
I, personally, do not think all these 3-point shots are sustainable. At least not for most teams/players. But this clearly looks like a special case in Oakland.