I think your choice of words has been rather less than you submit, but frankly you are still missing the main issue.,
Polling does
not show that Trump can't win. There are a number of polls showing strong, ongoing support for Trump, both among Republicans and voters in general.
Granted, some of that is name recognition and BIden is not exactly making anyone wish he got another term, but to get Trump to, as you put it, 'go away', you have to give him a reason to think that is his best course.
He's not going away without a good reason.
That which does not kill me, will try again and get nastier