Even though a few Repubs would have to vote along side Dems to actually force the impeachment, its not the Repubs talking impeachment. Not even McCain, who is really a War-mongering, pro-life Democrat, is the definition of establishment and I believe truly hates Trump after the 'not a hero' BS, is willing to say impeach". Impeachment will be associated with the Dems. And it will cause the market to fall. And thus any smart Republican (are there many left?) will immediately run on the platform that Dem's obstructionism is what is causing the economic consequences. There will always be partisan lines (why I explicitly stated the non-SJW Dems), but fighting Trump and being blamed for a market crash doesn't strike me as the way to win back the 'working-class' voter who has a decent job and a small 401k. The Dems also won't be able to run against Trump's record of not achieving his campaign promises or in improving the lives of the 'rust belt' because the Repubs will be able to clearly show that it was the Dems who obstructed those reforms or actions (rather than simply letting Trump fail on his own).