Its great that the players can fight off the affects. What we dont want is a bunch of loose canons walking around the city spreading their crap. If they come to play, isolate them and all involved. But how can we safely do that? Its not even remotely possible. Look at the precautions taken in a Level 4 Lab studying virus. Yet a virus still can escape.
Like I said before, the majority of the players are Canadians, thus they have a basic sense of common courtesy and common sense built into them. You're unlikely to spot an NHL player out on the street without a mask for example. 90% of them are coming to their homeland, the bubble cities are in Toronto and Edmonton, they will follow the rules.
What I am more worried about are NBA players, historically a more do as they wish kind of athlete, and the bubble in Orlando, Florida, a state that is completely gone off the rails.