Real change to the party has to include GOP congressmen and congresswomen standing up to Trump when he wades into the water of unethical behaviors (such as conflicts of interest), casts aspersions on constitutional principles (does the man understand the First Amendment?) and engages divisive rhetoric. He will threaten to primary them, will call them out in public and bully them however he can.
So far, they’ve proven to be spineless. They’ve turned a blind eye for so long, there’s no reason to think that changes.