That's why the majority of the party who aren't part of the new crop are placating him, there is no civil war they have decided to give up so they won't risk splitting the party. Lindsey Graham was openly talking against it on Fox News, Trump is an irrational sociopath however he is greedy. There is no profit from splitting the party, he gets more adulation and adoration by eating the party from the inside.
Trump is like those scary parasites that eat the host and possesses it to kill itself so it can survive and pass onto something else. I don't think Trump is done hollowing out the GOP just yet.