If Democrats don’t block Gorsuch they will have to answer to their base which also happens to be the majority and is presently making its voice heard in the streets and halls of Congress. The GOP has lit a fuse that’s going to be hard to extinguish.
And your hope that the GOP might survive Trump is wishful thinking. The writing is already on the wall. Demagogues like Trump are a dime a dozen. He couldn’t have attained the Oval Office without decades of the GOP paving the way for him. To expect the GOP to overcome the consequences of what they themselves have created is just more wishful thinking.
Unlike you, I’m more concerned about our nation surviving Trump than I am the GOP. Unfortunately, there are some who put their concern for their Party above concern for their nation.