That is simply not so. Again, there is no substitute for the dull and hard effort of a close reading of the entire line of Supreme Court Commerce Clause cases. The general trend is of the Court upholding increasingly expansive federal laws based on the Commerce Clause. Wickard is not a departure but a logical culmination.
I believe it is, but I'm willing to look at any evidence you have to the contrary, but I'm not chaning my mind until you produce some.
As far as it being a "culmination", it is indeed. But it is a "culimination" of a process of piling error upon error.