The Narrative, it is always the narrative the drives the news and not the facts. The narrative was pre-ordained from day uno to be that Trump crashes in the polls. Polls are the easiest things to divorce from facts as they can be manipulated and used to push opinion.
So far, Trump has defied all the usual narrative journalism dirty tricks by plowing ahead. It will be interesting to see if he can survive the polls shaping opinion trick.
Trump does his own polling. He knows where he stands. All the other polls are just incidental reading material. When the tide ebbs he will know it and will adjust his stance.