Nah, if its Hillary vs. Trump, it'll be a land slide. Since Trump will absolutely squander the Hispanic vote, Hillary will have the Hispanic, Black, LGBT, and woman vote. She'll also have the youth vote if she's clear on her student loan policy. Plus, youths are generally more liberal. Then there's the electorate which Obama won in a landslide against Mitt Romney. Given the economy's positive turn since then, it'll likely be the same.
Last time, Mitt Romney barely won the white majority. Given their already decreasing voterbase, if the GOP loses in 2016, that will probably be the end of them as we know it. They'll be forced to move left. This isn't taking into account congressional elections, though.