Other than the obvious drop in drivers due to unemployment, I don't see a plausible way that happens. Taking public transit is probably one of the riskiest act

Other than the obvious drop in drivers due to unemployment, I don't see a plausible way that happens. Taking public transit is probably one of the riskiest activities the average person might undertake in their day as far as contracting a virus. Whether or not that will cause people to take their cars instead is unknown, but I can't imagine it will increase ridership in the near term. Additionally we may see a slowing down or even slight reversal in the trends of populations becoming more urban and more dense. Living in a 400sqft apartment is doable for some people when they're spending most of their free time at bars, parks, restaurants, etc., but after enduring months of those places inaccessible the idea of living in a less-dense suburb may be appealing to people.