There’s an awful lotta “coulda, maybe, possibly” kinds of objections, along with a single study against a supermajority. I still remain supportive of a BBA.
He does as well. He is merely saying that there were some potential problems with the one that was proposed and that those problems could easily be avoided.
See here: http://constitution.i2i.org/2011/07/10/reining-in-congress-an-enforceable-balanced-budget-amendment/