Maybe today uber still requires human intervention but this is looking a little into the future. I do think even today driverless cars are safer than human controlled ones, and the technology is very new, what about in 5 years? 10? Biological motor skills will not be competitive against computer controlled cars in the future.

Legality is a different issue, it'll depend on your jurisdiction and there's a tradeoff between safety and freedom. I don't see them rendering manual cars illegal even in the most progressive countries any time soon