The Clintoons are gonna think long and hard about dragging up some dirt on Trump. The guy absolutely has a boomerang halo effect over him. Throw junk at him and expect it to return right backatchya.
I think the problem there (opponents throwing salacious dirt @ Trump) may now come more from the part of the GOP-e that feels endangered by a Trump win. But, even then, Trump can short-circuit them by throwing the Clinton’s history at Bill & Hillary, and, he can point out that he is running against an Establishment composed partially of “rigged system” Republicans.
He can also continue to stress that “either we can talk about these things” (salacious stuff) or issues that really matter to the country (and then he can wallop her either way.)