I’m thinking that the truly “undecideds” will gravitate toward Trump if he continues the way he has.
1. The MSM is pretty much despised if polling is correct, and Trump is brutal with them.
2. If nothing else, people are realizing that America might be fun, active, and interesting again if Trump is running the show. They’ll vote for him because they can be engaged and interested.
This factor has probably added at least 10%-15% more voters to his column in every primary during the GOP campaign. It's also going to help him make inroads into Clinton's support among blacks, who are culturally conditioned to place a high value on entertainment.