Some of these would likely require constitutional amendments. Given our threshold for passing that (38 states out of 50 must ratify), this is extremely unlikely to happen for any suggestion that is likely to negatively affect either or both of the large parties that we have.

For the remaining stuff, you need federal bills passed, so we're talking about both chambers of Congress + president. So the one party that isn't opposed to all that needs to have a trifecta, for starters. Majorities are razor thin these days, especially so in the Senate, so filibuster in the latter is another hurdle (although it could be dropped for something like this).

That's why it's such a nasty deadlock - the system is in a state wherein there are no legitimate methods to recover its operation.