This campaign has not caused anything worse than scratches between the candidates themselves. Sanders is not technically out of it yet and he has favorable states coming up, so he owes it to his supporters, who literally blew up the "corrupt campaign finance system", to stay in the race.
At the convention, I expect Sanders to be given the respect he deserves by the party and for him to be gracious in defeat and call for unity against Trump. There won't be any grandstanding like Ted Kennedy at the 1980 convention.
Knowing Bernie, his convention speech will be something along the lines of:
"In America today, we have a billionaire class which controls a vast majority of the wealth. According to the latest figures from the Bureau of Labor Statistics, approximately 20% of workers..."
etc.
etc.
etc.