I don't think we'll see the riots we saw in 1968. Most of the men have been feminized and aren't likely to want to get their Dockers dirty by marching in the streets and getting doused with fire hoses and tear gas. These are "pajama boys" who will simply conclude that "politics is stupid, anyway" and retreat to their parents basements and binge watch "House of Cards" on Netflix in seclusion. Like what they did after that "Occupy Wall Street" movement. Maybe they come out and vote for Trump in November, maybe they don't. But I don't see them rallying around Shrillary after she pulls those convention parlor tricks on their beloved Bernie.
One tiny example of a Bernie voter planning to vote Trump is my democrat SIL who is anti Hillary. I doubt she is alone in wanting Hillary gone.