There are a lot of things I'm not sure about the 2016 presidential election, but the fact that HRC will win Nevada easily isn't one of them.
I know pollsters undersampling Hispanics in NV has been a problem in the past, but we can't just assume that it will happen again this year.
In 2014, the RCP average had Sandoval up 25 points. On election day, he won by 47 points.
In 2012, only ONE NV poll out of 36 showed Romney narrowly ahead of Obama (and that was in April 2011).
This year, pretty much all polls have shown a very close race in the state and even Joe Ralston says it's not a safe or even likely Clinton state.
http://www.realclearpolitics.com/epolls/2012/president/nv/nevada_romney_vs_obama-1908.html#pollsIn the end the margin was 4 points higher.