Trump has already destroyed the Republican party. Quite a feat for someone who is not, and never was, a Republican.
I think there will be a difference in the Republican Party BT (before Trump) and the Republican Party AT (after Trump). Those Repubs voting for impeachment may find themselves beaten in the primaries and sitting out elections.
If not the party will wither away and die.
There is a difference in the party before and after Trump. Before Trump, Arizona and Georgia were Republican. Now they are swing states.