The NBA has had a promising start to its bubble season. Other than isolated incidents of unappetizing food — or people going outside of the bubble to procure more desirable food — the experiment has to be considered a success thus far. The safety protocols have worked to keep the coronavirus away from the NBA campus, players and other personnel have the ability to leave and come back in an expeditious fashion, and everyone involved seems to be enjoying themselves.
Coupled with the fact that both American professional soccer leagues have either staged bubble tournaments or are currently in the process of completing said tournaments, and there is substantial proof of concept in this model for playing sports during a pandemic.