You never know. Just think of all the advances over the last 50 years. Hard to imagine where the world will be in 100 years. Hopefully some terriost group won't figure out a way to nuke the world along the way.Owning/driving cars. I think something will be invented that will allow people to float in the air to their destination for short trips. At the very least, mass transit will be improved to a level we can’t even imagine.