The wealthy and the high income earners will start avoiding buildings, businesses, and organizations that won't or can't sufficiently upgrade to be considered safe. Their money will flow and support the healthy/safe alternatives.
Those that are left behind will be the dregs that the poor and desperate use and will gradually fall into disrepair until their owners go bankrupt or give up and sell to someone who has the means and drive to upgrade or demolish and rebuild.
The same thing happens to any old infrastructure where people can vote with their feet.
I think the challenge with indoor air circulation is the energy required to do so, especially when heating/cooling of the air is involved.
But, I'd sure love better indoor air quality.
What means it's probably useless against any airbone virus. But it's pretty great against particle pollution, in case you want to use it in a private space.
Just in case smaller particles have a substantial role, I quoted the 1um number.
I could see it happening in new buildings, though. Possibly in existing buildings if an easy-to-read summary number for ventilation became popular and the numbers for specific spaces became easy to find and widely publicized. Then companies might be willing to pay more to rent space with a higher "ventilation score", especially if employees balked at working in spaces with low scores.