We just had a pandemic where public transportation ridership plummetted and it hasn't recovered. To make believe that sharing microbes with other commuters on a tram or a bus is not a consideration is pretty disingenuous after what we just went through. I am a bicycle commuter, but we have two things where I live that make it really difficult, one is hills and the other is weather including snow. Every place isn't flat with mild winters like Holland. Geography plays into every place's commuting patterns in a unique way.

One issue that you don't address has to do with aging people, and we are talking about a third of their life. That car equals freedom to them that they will not give up until they absolutely have to. Giving up their driver's lisence now is essentially putting a toe in the grave. We should be moving toward point to point autonomous EVs for public transportation, which would replace cars quite nicely for them. The technology already exists, and it requires zero new infrastructure. Building more tracks or huge buses is insanity. No one wants to hike to a bus or rail stop and wait in the rain or heat if they can drive. Unless a better system exists that picks them up at their door and where they don't even have to park, they will stick to their automobiles. Let's get out of the 19th Century on public transportation. You can't try to sell people the same old crap (With diseases added.) and expect them to enthusiastically buy it.