Cars will never be dethroned. Yes, trains are cool - choo choo motherfucker. Yes, bikes are environmentally friendly. Yes, the car is a truly fucking horible answer to the question "how to get from A to B".
But that's because cars are the answer to the question "how to get from A to B comfortably". I don't want my baby and my in-law to get on the back of my bike when we're going camping. I don't want to take the train and then walk 2 miles from the station every single fucking day with 20kg of tools in my hand, because shit, the train doesn't stop next to my house, and it doesn't stop next to my work. I want to be able to have acces to comfortable transportation.
So the answer will still be the car. Even with everyone crying about it. Cause the cat's out of the bag with cars, we made them efficient and cheap enough to not be considered luxury items anymore. And some countries (see: US) have their entire infrastructure built with cars in mind. You're never putting the lid back on this, even if it's a decent idea.