There is no way he can get 60%, not with how he does among women, and minorities. I've said before I don't think any candidate will get over 50% in this election, considering both sides picked the worst possible person to run for them. Gary Johnsons is pulling support from both sides and will keep everyone under 50%. It is all going to come down to the electoral college, where the Dems already have a huge advantage and Trump is doing nothing to change that.
You are 100% correct. No candidate is polling nationally higher than the 40-49% range. Sure, Trump will win the red states because they're red states (unless his campaign completely collapses, which I doubt will happen). Clinton will do the same with the blue states, but, as you mentioned, the Electoral College table favors Democrats. Republicans have to win more swing states than Democrats do because of the red state-blue state difference in electoral votes.
Trump is NOT doing well in those swing states. Clinton is unlikable as a candidate, but Trump is making himself so unlikable as to drive people away from him. He has his hardcore supporters, sure, but so does Clinton (who are probably more hardcore Democrats than Clinton supporters specifically). Who will the swing voters pick?
Swing voters don't typically care about the ideological issues of the party purists. If Trump comes across as reckless and scary, then they will vote for Clinton, even if she comes across as inauthentic and dishonest.
To some degree we expect politicians to be liars and cheaters. Clinton's shenanigans are no surprise. What we don't expect is a loose cannon. Trump has to reign himself in some (not completely, or he would lose his appeal) so that he seems like an anti-establishment candidate but one who would provide steady leadership. If he does that, he can win. If he doesn't, on Jan 20, 2017, we'll all be meeting President Hillary Rodham Clinton.