They would have to cancel all games for all leagues for that to happen. In that case, there would be no teams to play against. If some provinces can play, I don't see HC stopping them.
As others have said, it's not up to the Univerisity or U Sports wether we are allowed to play to start off with. Without the NSO's sanction, no university in their right mind would allow it's student-athlete's to participate in any game and/or practices. There are too many risk factors in organised sports going forward without NSO santioning it and allowing their liability insurance.
As for some provinces being able to play and other's not, what would be the point? Let's see for the AUS, if we exclude NS (which is likely at this point) we get:
- Football : 1 team (if NS is a no-go, QC likely will too, so no Bishop's)
- Basketball (M/W) : 2/2
- Hockey (M/W) : 3/5
- Soccer (M/W) : 4/4 (5 on both sides if MUN is in)
- Volleyball (M (RSEQ)/W) : 1/2
So there you have it, the only league that would operate at more than 50% of membership is Women's hockey, and you'd still eliminate the top-2 seeds from last year. Men's and Women's soccer would be at an even 50% but you'd eliminate the top-2 on the men's side (4 of the 6 playoff teams would be out) and the top-4 on the women's side (5 of the 6 playoff teams if MUN isn't there!) .
So I don't see any of that being plausible to have a season if things don't get better in the other provinces. And I don't want to play meaningless exhibition games either. You increase the risk of injury, the risk of players doing something stupid (won't hurt the standings/doesn't count) and costs money for no good reason and exhibition games rarely bring in a decent crowd, no matter the league or level of play.
To put on a game costs me 420$ in officials, 300$ in minor officials (bare minimum, lot more than that for regular ops), 225$ in security (have to have it if the bar is open), and about 1000 $ in potential ice rental revenue. Away games aren't any better, 1,500$ for the bus ride, 400$ for meals it all add's up pretty quick.