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"? If a position isn't worthwhile to hold unless exploited, only exploiters will step up.

I don't know what kinds of offices are the issue wrt the MTA, but generally I have the impression that the USA could be better off with some elected offices less: an elected position is inherently unstable as far as careers go, so they appeal most to people with a bit of a gambling mindset. This is unavoidable in the highest ranks ("...worst form of government except all the others that have been tried"), but in the lower, less visible ranks where the corrective qualities elections are supposed to have apparently do not work very well, "low balling" bureaucrats might, on average, be the lesser evil.

However, even if there was widespread agreement over this (I suspect that it is quite a minority opinion), I don't see much of a migration path because a migration from elected to conventionally hired public servants would be beyond pointless if the new guys inherit all the broken culture from their elected predecessors.