Stability also requires a stable government. Throwing all the scoundrels out sounds good, but would probably happen (I think they are all too selfish and would play chicken down to/past the wire). Resulting in chaos at the next election - an entire elected body of unknowns with no experience.
That's the kind of revolution we're supposed to have when the government becomes corrupt. Also, it wouldn't be all at once; term overlaps ensure that there would be continuity.
In a house election the incumbent almost always wins. Everything is skewed towards their favor, and lets not forget modern gerrymandering, which essentially predetermines most congressional seats.
