Clearly no sign of buyer's remorse among Republicans. This confirms my belief that Trump would easily win the nomination again if there were a rematch.
But that's because he's already the nominee, and so many Republicans have talked themselves into thinking he's great. If Rubio were the nominee instead, then Republican voters would have similarly favorable views about him, etc.
Also, assuming a Clinton victory next month, Trump will no longer be the party's standard bearer on Nov. 9th, and so many of these folks who nominally prefer him now could well then say that they prefer Ryan's vision, since Trump will no longer be the party leader.