The Commerce Clause is quite useful, which is why it was there in the first place. We don't want states to impose tariffs on other states' goods, for example.

That it was appropriated to justify the massive expansion of federal power is another matter, but, well... given how absurd Wickard was, I'm pretty sure that if it weren't the Commerce Clause, it would have been something else.

As for majority voting, all alternatives are strictly worse. The problem, rather, is that there's no meaningful democracy at federal or even state level, because there's no meaningful representation at that scale - the "representatives" are anything but. I'm not sure there's such a thing at any scale, actually - for all the purported benefits of representative democracy wrt preventing mob rule, history has plenty of counter-examples, including US here and now (it's a minority mob rule, which is even worse).

I'd rather have direct democracy, but only so long as it's truly deliberative (i.e. not just people voting on a list of yes/no questions put in front of them, like referendums - think more along the lines of, say, how the Constitutional Convention worked). And scaling that requires some form of council democracy, with enough levels that meaningful deliberation remains possible on every one of them, all the way to the top.