I dunno, honestly, but there should be few republicans who might be able to capitalize on some republicans not liking Trump. They might even try to encourage independents to vote against Trump. However, I'm willing to bet that even if Trump did lose the primaries, most of his supporters would back up the republican candidate anyway because right winger/conservative. I expect no logic from the same group of voters whose main reason for voting for sexual assaulters was because it'd piss liberals off. These people HATE anything left wing, Democrat, or liberal.If any Republican primary candidate would have more support than Trump, than who would it be? And who would be willing to challenge Trump and supporters he has in the RNC? Maybe Kasich? But would he have the support that Trump has? At best it would cut the party in half and Trump's supporters would be more likely to vote for an Independent/Dem than they would vote for anyone who challenged him. It would be a clusterfuck, and they'd have little chance against the Democratic nominee, unless it was something insane like Hillary again or Pelosi.
No Republican challenger would vow to continue Trump's work because the point of challenging him right now would be to prevent him from getting a second term.
They might some, and they might even continue the bigotry that he used to get votes.