Two or three of which are very vulnerable in the election, up to three of which could be vulnerable with the right opponent, and at least three who might vote against Trump just because he's Trump. Filling a seat between now and January 2021 is not a done deal.
I agree we could have better Senators and technically something might come up, but if they couldn’t stop Kavenaugh when we were at 51, they’re not stopping someone like Amy, and they won’t even be able to slow her down, unless they go full violence.