I think Sanders is pragmatic enough to back Hillary for a slam dunk win rather than roll the dice. Were he that bold, Ya, I expect he'd be able to win, but it would be a nail biter.
The truly impressive thing this season is that not one, but both parties has managed to make so many people mistrust them and believe the system is rigged to ignore the will of the people. (Or, if you prefer, to fumble such that so many all wake up to reality at the same time.) Yay internet?