Yeah, some sports are already allowing this. It depends on the circumstances in your area. Based on what I'm hearing about the US, I don't think anyone should go... but some people certainly will.
More virtual engagement could be cool. Ex: press a "like" button online to trigger an increase in artificial crowd noise. Then fans could try to show more support virtually
KC had their openers with fans and one of them tested positive. Surrounding spectators and possible staff that had interactions with them were quickly contacted but any small cluster is going to impact the rest of the season. Whether its down to none or the league is temporarily suspended. Not worth imo