Your venues will be some of the harder problems to overcome IF we've to live with SD going forward, my point about entrepreneurs was more about solutions to overcome SD.
Drive by most hospitality venues and you'll see a few fans stuck to an outside wall, inside you'll likely see tables and chairs alongside some built in booths, currently most will have some forms of perspex dotted about, the fans and perspex are their to control and adjust the airflow in these venues, I'm just a layman but surely their must be the possibility of innovation creating a new way to control airflow whilst extracting and or neutralising any airborne nasties, having a booth that has no perspex separating it from the next one but rather an invisible pod created by a new system that keeps most of the crap from moving between different sections.
The above, if possible, wouldn't eradicate Covid or similar in a venue but it would reduce it significantly.