There are lots of replies about safety here and that is of course the major principle. But safety is not just about 'not crashing'. It's about not getting into situations in the first place. It's the experience of a crew to avoid a TS upwind rather than downwind, to slow up on final if you can tell someone is dithering on the runway, to realise the most efficient way (which you can be damn sure the computers will be programmed with) is not always the best.
Pilots are here to stay. No computers can have experience and airmanship.