I would think this current crisis would make people even more leery of public transport and cutting car use is not impossible but that it will take a governmental forced lock down and martial law. Maybe we should think about ways of reducing the downsides of individualized transport instead of promoting 19th century solutions (large crowded subways). Electrification, reduction in size, tunnels, etc.
Yes. Biking and walking are also great transit modes depending on the distance, speed, and cargo needs of the trip. Although crowded sidewalks is something to avoid at this moment.