I wouldn't be all surprised if he decided to go. He's had an awesomely difficult time and, having climbed the greasy pole, he's maybe achieved what he set out to do - getting to the top. He was very resentful that his Oxford mate Cameron got there first. He's also skint so the Blair option of making megabucks in a very short time must be appealing. As for his legacy, he can always say 'he get Brexit done', however vacuous that line. And if he were to go would most people think too badly of him? I think not.
The UK was alerted to Covids potential in late February when it struck Spain and Italy. Boris did nothing for a month. When the virus did get here, thousands of patients were send from hospital to Care Homes full of the most vulnerable, and the resulting death toll put us far above the rest of Europe. It was another terrible error. Big Contracts to combat Covid...