I think its even more optimistic to assume autonomous vehicles are likely to be mainstream, much less in 20 years. They don't even exist yet, meanwhile high spe

I think its even more optimistic to assume autonomous vehicles are likely to be mainstream, much less in 20 years. They don't even exist yet, meanwhile high speed trains are proven 70 year old technology. Electric cars have been out for over 10 years now and they aren't even taking over.