It won't be 1968.
HHH was selected by party leaders, while McCarthy and Robert Kennedy won most primaries that year.
Biden won all dem primaries
An alive Kennedy could probabky had ended up being rhe nominee.
Agreed. It won't be 1968, no matter how much some want it to be. Tensions would probably be higher if there was a dedicated pro-Palestinian candidate who ran against Biden. So, honestly, the 2016 convention might look worse in that sense when the Sanders supporters really made their presence known.
There probably will still be protests, though how big they are may depend on how relevant the Gaza issue is or isn't by August. And, honestly, who really knows? I hope it'll be mostly settled and out of the news; but when we're dealing with both Hamas and Netanyahu having to come to an agreement, erring on the side of pessisim is warranted.