While the GOP would really like to do this, it will lose them the election, no matter who they run in Trumps place. However, it may save some down ticket seats. As is, if those down ticket endorse Trump, they are cutting their own throats. And, if they don't, they are cutting their own throats. The GOP has put itself in an amazingly unique position.
The amazingly unique position of nominating a hugely popular, although polarizing, candidate. The SJW's on universities across America have pushed so far, there is a grassroots, populist uprising that is not even motivated solely, or chiefly by policy. Trump's support for enforcing the law resonated. It resonated because polls have consistently shown a plurality of Americans support immigration law enforcement. The GOP establishment were lock-step with the left on immigration. Trump's rise is much more to do with culture than policy.
Go ahead and continue believing Trump is just a aberration, talk to me in November.