Well, in light of this citation I have to agree with you. There may be many circumstances where the states should retain authority in interstate commerce. And policing that commerce. This statement makes very good sense, thank you for presenting it.
I will agree that as things change there may be some areas where it is appropriate to grant Congress that power but it isn't supposed to be convenient or easy. The process of amendment is there to modify the balance of power between the States and the general government. It isn't supposed to be "efficient", and it is that way on purpose and for good reasons. The idea that simply because a majority of Congress voted for it and the President signed off on it is sufficient to make it a valid exercise of the ommerce power is an abject subversion of that intent.