2) Never is a long time. As I am not omniscient nor a soothsayer I cannot say that what you are claiming is true or false. I will admit there is little likelihood the Republicans or the Democrats would elect a non incumbent to run as their Presidential candidate when an incumbent was available. to stretch that out to eternity is a bit too much for me. I'm fairly sure a large segment of the populace were firmly convinced that the Republican party would never nominate Donald Trump until it actually happened so I try not to say anything is impossible. So what I think will happen is that Trump will have a token opponent or two and have an easy time getting to run for reelection as the Republican candidate and right now I would put my money on Joe Biden being the Democrat candidate with a running mate that is sufficiently some combination of dark skinned , female and SJW to keep the identarian leftist faction from bolting when an old white man turns out to be the Democrat candidate. My wager though may turn out to be a bad one as no one knows what will happen in the future.