I know you've talked about indoor air filtration, but I doubt that will even do much to reduce R0 if you have people congregating without masks.
Other than that, I don't see any plans that don't involve continued distancing until we get to a vaccine, or failing a vaccine, get to natural herd immunity.
I don't even understand what those plans could look like.
Which is to say, I have to think this is one of those situations where alternate plans existed, someone would be saying something. But they're not, and with as many people in the world looking at this as there are, makes me think alternate plans won't exist.
We've seen detailed, reconstructed diagrams of the way this thing spread in a couple of different restaurants, based on where Patient Zero was seated next to an air return, and the way the ensuing outflow from vents cascaded across table after table of Patients 1 through X. Just imagine if a submicron air filter had been in place, imagine the limit to the spread in that one restaurant, and then all the people infected at second touch, and third touch, etc.
I've also read numerous accounts of how airplanes are considered largely safe, due to their filtration systems.
So no, I'm not going to agree that there's simply nothing we can do to help, regarding air filtration and improved ventilation for indoor buildings.
Like a mask-- in fact EXACTLY like a mask-- it's not a guaranteed solution. But it can certainly be helpful.
I don't think we're getting an effective vaccine. It would be nice, for sure. But that's not the basket where we can afford to place our eggs.
We're smart people. We need to start doing smart things.
Living in isolation indefinitely isn't smart, and it's already failing miserably.