@libertybele I think
@Jazzhead is envisioning something like a what happened with LBJ in 1968, where people went to him, told him there was no way he could win, so he needed to step aside for the good of the party and let someone run in his place who had a chance to win. But there are three major differences between LBJ and his situation, and Trump and his:
1) There was a singularly unpopular, dominant issue during that campaign season. Namely, the Vietnam War. And
nobody really would have disputed that LBJ screwed that up royally. Especially in terms of his credibility. In contrast, there is no single substantive issue on which there is agreement that Trump has screwed the pooch. In fact, on the economy, he's arguing hitting home runs. So there's no substantive hook that makes his candidacy look doomed.
2) LBJ's actions with respect to Vietnam made him wildly unpopular even within his own party. He was the pro-war President of what was rapidly becoming an anti-war party. And if your own party won't even vote for you...you have no chance of winning a general election. Trump, in contrast, is very popular within his own party.
3) Most importantly for purposes of this discussion, LBJ was a very calculating, lifelong politician who could read/would believe polls, and had a very acute sense of what was a winning issues/candidacy, and what wasn't. He trusted his own advisors and his own political sense to judge that he could not win. But Trump isn't a lifelong politician, and he actually detests/mistrusts more politicians. He has very little faith in pollsters as well, and in fact won election when just about everyone was telling him he couldn't. There is not even the barest hint that he'd seriously consider a suggestion from Romney, or the Koch Brothers, or anyone else that he should step aside. He'd be far more likely to make their request/demand public, mock them for it, and tell them there's no way in hell he'd ever abandon the people who elected him just because a punch of career pols told him too. And his supporters would cheer him wildly for saying it.
Trump withdrawing voluntarily is a pipe dream.