That's not 7M vehicles concurrently though. At any given time maybe there are a few hundred thousand trips happening. With self-driving cars utilization can go

That's not 7M vehicles concurrently though. At any given time maybe there are a few hundred thousand trips happening. With self-driving cars utilization can go way up since they're not tied to a human. and. So I imagine Goog/Lyft/Uber etc would quickly acquire a fleet of 100k vehicles for a few billion dollars.