I certainly would love to see the Republican Party crash and burn under Trump, but I don’t really expect this.
If it were to happen, there would still be a Conservative Party. It would be the Democrats. The DNC and the right wing of the Democrats would try to become a
single unified party representing Wall Street and the Military Industrial Complex.
It would likely break apart in the effort. That would also be great. The Bernie wing and some Green and radical life style factions might end up leaving or being expelled. A new alignment of major parties might eventually emerge out of all the factions not just of ex-Democrats but also of conservative libertarians and civil libertarians, small business groups, anti-imperialists and even internationalists. Impossible to predict.
The most likely immediate development is growing imperialist “Bonapartism” and decay of American political life as lunatic right populism grows. Even if Trump loses, that right populist movement will continue to fester and parts of it may move to outright “American fascism.” A hard right party, not quite fascist, similar to European rightwing nationalists, is most likely to coalesce, gathering up these remnant elements, if the Republicans really do destroy themselves under Trump.
But as I said I don’t expect that to happen. Trump may well win the elections, or lose in a very close election. That, in my opinion, would probably be the worst outcome possible.