As they deserve to do, and as they already are.Anyone not heavily involved with the campaign will just claim they were being loyal to the choice of their party. Which will be enough for some people. They don't really need to "expel" Trump because he was never really part of the party before the election. Trump goes back to being a billionaire asshat, who probably makes a lot of money off his loss, and the GoP are left picking up the pieces.
I think a lot of the more strongly involved individuals are going to have some fences to try and mend if they ever want to go anywhere. GOP needs to seriously look at restructuring through if it wants to win another presidential election. Starting with ousting, or at least ostracizing, some of the more wackadoodle members.