Can they extend the season an extra 3-4 weeks?
NBL might try to get through the rough patch with a possible peak reached in Feb? March/April may, optimistically, be "more normal".
I guess this is where NBL Cup came as an idea just to make sure games were happening even if it meant extra games and a glut of games.
If they're extremely concerned, they could try hubbing 3-4 teams in a few cities like Cairns, Hobart, Illawarra - see if players are willing to “bubble” for 3-4 weeks to avoid external factors and frontload home games for Taipans, JJs and Hawks, then reevaluate approach towards March.
At the end of the day nothing is perfect, if Covid gets in and ruins things then so be it, but an approach like the above might give improved chances of just having games going without radically changing the season.