I am still depressed that we won't get to see Sausage-Fight 2016, but here's an interesting twist. I thought that the Democrats would put pressure on Sanders not to do it. Trump was the one who pulled out, so to speak.
One of the more fascinating aspects of Trump's persona is his inability to exercise restraint. There is an old line in politics about punching up, not down. While it would have been the kind of swipe at Clinton that suits Trump, debating a loser is punching down. However, Trump is virtually defined by the fact that he can be drawn into a fight with anyone. Note his continued obsession with Rosie O'Donnell. Punching down is kind of Trump's thing.
Not this time, though. Apparently he can learn. Who knew?
A moment of silence, now, for the event that never was...