1968 happened because after Johnson pulled out party leaders nominated Humphrey, who hadn't participated in any of the primaries. I wouldn't say the current situation is entirely different from 1968. If it weren't for the super-delegates Hillary wouldn't be the nominee, and there are a lot of peeps who think the nomination is being stolen.
“If it weren’t for the super-delegates Hillary wouldn’t be the nominee”
Yes she would be. She will get a majority of the regular delegates, no problem. She’s too close to the magic number. She can lose over 60% of those still outstanding to Sanders and still win.
Conversely there is no way Sanders can get a majority.
The superdelegates, because they could abandon her at any time, are the biggest danger here.