The debates ‘should’ create a tidal shift toward Trump.
Historically, debates have been shown to have a negligible effect on polls. There are exceptions, though (eg, Reagan v Carter). I wouldn’t get my hopes up regarding the debates. Clinton will be professionally coached with poll-tested one-liners against Trump. While he thinks well on his feet, she will be playing solely to the vagina factor, baiting him for some kind of “misogynnist” comment that the media can run with. It will all be pre-planned (collusion with the MSM).