Would a Trump Republican Nomination guarantee Clinton becoming President?

I don't think so. Here is why:

If the Republicans in Government have another "Witch Hunt" on Hillary by trying to indict her for revealing state secrets through her emails it is possible that she will not be president and instead Trump might become president instead.

However, no one in the status quo in America (the leaders of America) wants this. So, this is an even crazier election than ever. So, if the status quo prevents Hillary from winning by the Republicans witch hunt in Government we might just wind up with a Dictatorship with Trump as Emperor instead.

So, things are really screwed up in the U.S. and the U.S. is experiencing: "A Clear and Present Danger!" to it's continued existence as a democracy in a Republic.

So, if you see Trump Assassinated and Clinton in jail put there by a total witch hunt, then you know the Richest Republicans in the U.S. likely are behind this along with the World Trade Cartel.

So then you would fully realize that we are in some kind of dictatorship and democracy is completely a sham here in the U.S.

oligarchy I think they call it.

which basically means: "Of the rich by the rich and for the rich" and nothing else.

And might I say that this is the road to human extinction here on earth likely by 2030.