[Chathamization]

> I'm a total outsider to this (being European and all that), but could lack of vote-created change be due to lack of serious candidates who are not the "usual suspects"?

I doubt it, mostly because when good candidates run you still see pretty low turnout and the good candidates often lose (and with downballot races, even the few people who bothered to vote have a hard time remembering who they voted for, let alone why). And this kind of apathy is everywhere; it's not uncommon to see some nationally famous political writers who are extremely ignorant about major local elections and don't even seem to care about them. And when it leads to bad outcomes, many people see that as an excuse for even more apathy: "See? We don't have a choice, this is an oligarchy, it's impossible to change things by voting, why bother."

I think you have a decent point about fewer elected offices, but it's hard to make a blanket statement because it's very situational since elected offices vary a lot by state. The political parties themselves could also benefit from fewer elected officials, for what it's worth.