A toxic environment to me means more polarized, and that implies less squishy "I don't know how to pick" middle people (who are frankly mind-blowing to me, because the parties stand for very different things on a number of key issues.) I don't see how that makes polls more variable, 538 talks about it in fact.
Anecdotally, I don't see the same level of "both parties suck, I'm voting protest or writing in Bernie!" this time around. That goes with the statement of "we need to burn the system down, so maybe Trump is what we need". Well, he's indeed burning it down--getting what you want, yet? If you are ultra-rich and like swimming in pools full of 100 dollar bills Scrooge McDuck style, the answer is certainly "yes"--which is why this guy is wishcasting what he wants.