I can's speak for other states, but Boxer & Feinstein are definitely vulnerable BUT the GOP has GOT to provide a solid candidate to beat them. IOW, no more RINO’s like Ahnold.
Much as I would LOVE to see Term Limits, there are two chances of that happening...slim & none and “Slim” just left the building.
No. The voters of those districts will just elect somebody as bad or worse.