While I simply don't trust all the various polls in general, one point I do think is accurate, regardless of the poll, is the "Trump suppression vote". That's the term being used to account for people that will vote for Trump, but won't admit to anyone they're voting for Trump.
I think that's a real and significant number. No idea what it might be or how it might change in the next month. However, assuming a theoretically accurate poll in the 50/50 range, I'm thinking it's a large enough number that it would give it to Trump with a decent margin. If polling shows it as something like Clinton 49%, Trump 46%, I think closet Trump voters will put him over the top plus make progressive heads explode in a "he cheated!!!" kind of way.