The dead comment below by AnthonyMouse already pointed out that even in your scenario there's no difference with the status quo anyway. It's insane that it's dead and reeks of astroturfing, as nothing about it is worth flagging.
> Isn't that the other way around? The law already can't be enforced against the TBTF corporation, so what do they care if it stays on the books? But now you can't enforce it against someone else or they can point to you not enforcing it against them.
> Except that's the point. The government would now have to do that or they lose the law. If it's a good law then they don't want to lose it, but if it's a good law then they should be enforcing it against them.
> And, of course, the correct way to deal with this is to break the TBTF corporations into many smaller pieces so that stops being a problem.