If Trump wins the nomination will it be the end of the modern Republican party?

[Famous Mortimer]

I do believe that if he is nominated the GOP will be dissolved after a landslide defeat by the Democrats. Discuss.

That is a very very stupid thing to believe. In fact, a Donald nomination and defeat ensures the GOP goes back to normal in 2020. A Donald victory, now that would be pretty weird, that might lead to some people disassociating from the Republican Party. The party still wouldn't dissolve though. Again, a very stupid thing to believe. You should feel ashamed and foolish if you do.

[Famous Mortimer]

If the GOP establishment try to hand pick a nominee, then the far right will splinter off into another party.

I honestly hope that happens, the far right splinters off and by virtue of that happening, the party moves in a more centrist direction and becomes more appealing broadly

Well first off, the idea that Trump is the right wing of the party and the party will move leftward to get AWAY from him is backwards but whatever, I'll go along with you for the sake of argument.

If the nomination goes to anyone other than Trump, that person, for the sake of the GOP establishment, better sure as hell win. If they deny Trump the nomination, give it to Cruz or Kasich, and Cruz or Kasich loses. Trump has been proven right and either he or a surrogate will be back to take the nomination in 2020.