It's all a heck of a lot richer story than that. If she's not just a curse word by now, Amity Schlae's (sp?) book on the Depression isn't bad at all.
I dunno; all the bright-line false alternative stuff doesn't work. Economic history is still interesting.
I believe it turns out that the regulation that got repealed probably would not have mattered much other than possibly setting up transparent exchanges for derivatives, and that seem speculative as well. YMMV, IMO, all that.