NYC and London have had 'proper' public transit for over a century. It's handy but not that great. I was on a 52 year old Bakerloo line tube train the other day and they are much like modern tube trains, if grubbier. It's not going to suddenly turn wonderful and solve everything. (typed on a London bus)

Also while I'm not sure any technology is really needed, as in we could get by without it, there are about 1 million road deaths a year globally. A 90% reduction would save 900,000 lives which is a nice to have. And more meaningful than a space pen.