Sounds like the NBA is leaning towards following the NCAA's example and mandating that games be played with no fans in the stadium. The other option on the table is to postpone all games until a later date. I don't think option 2 is viable because its too much of a muscle mover.
Each team has roughly 20 games remaining. That's 20 games for each team where you have to make all new travel arrangements, make sure venues are available because a lot of these stadiums hosts concerts and other events during the season; then what happens with the draft, TV partnerships, etc. Just way too much work to postpone that many games in such a short period of time.
So I think the likely scenario is they'll be playing games in empty stadiums.