The CFL, much like the NHL, is playing a waiting game. Basically, they are waiting for infections to drop to the point where governments are going to feel comfortable in allowing crowds at games, concerts, etc. It's a slow process - the public is just now warming up to the notion of going back out to a restaurant in a couple of weeks, so concerts and stadiums will be a while, and there is no chance that a politician wants to get too far out front of public opinion or advice from their Medical Health Officers.
I've got early July as a rough estimate for when the first provincial Premier might be willing to at least publicly discuss this possibility. That's seven weeks from now, so plenty will change between now and then. I don't think crowds will be allowed back then, but at least they might be willing to signal that they might allow it by September 1 if all goes well. That's what the CFL would need to squeeze in a half season plus playoffs. (Say, 10 regular season games plus playoffs.) It's certainly no guarantee, but I don't think that anyone is willing to throw in the towel on the 2020 season quite yet...