self-driving is an 8T / year opportunity, and some pioneers now feel that the ground was a mistake, and personal transport is going to move to the air. Sebastian Thrun, the most respected pioneer in the self-driving car space, has largely abandoned it and now preaches that the air is where the action will be, thanks to computerized electric vertical take-off aircraft. Air travel offers almost unlimited “lanes” of traffic in 3 dimensions, with trivial costs in infrastructure compared to the ground and is considerably faster. This is just one of the things which might happen when you start trying to predict decades out. There are others which people are yet to think of which may change all these numbers in even more dramatic ways.

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