I won't be sitting out any elections. I will be finding republicans/conservatives to run against them. The House has been pretty steady, imho. It is the Senate that is weak. I agree with you on the two main issues and if these republican senators are gonna jump ship, we should find republicans from the house or elsewhere to replace them.
If you can find a candidate and win a primary against them, go for it. If not, I want them to lose.
The House WAS steady until Delay left and the RINO's took control. Without Delay they are about worthless, apparently, except for protecting the President which is important.