I think that's a way too positive/naïve viewpoint. For the transportation model to change, infrastructure and services are needed (trains, subways, trams, buses

I think that's a way too positive/naïve viewpoint. For the transportation model to change, infrastructure and services are needed (trains, subways, trams, buses, everything around them like stations, signaling, staffing, ticketing system), as well as appropriate density and city layouts ("transit oriented design" in the US, "common fucking sense" everywhere else). Those won't just happen overnight because car ownership is more expensive. There needs to be significant buy-in from the population, politicians, and money. Those are present, to different extents, in most big cities in some places (e.g. Europe(including Russia), China, Singapore) but really aren't in some other like US and Canada. Car ownership would have to get a whole lot more expensive and impractical before Americans who think buses are for the poor and homeless realise the inefficiency of "a vehicle per person" and accept the investment and lifestyle changes needed to switch to a more efficient model.