@slf4life
The Victoria Line in London has been computer operated, without drivers, since the 1970s. (That bloke at the front who pretends to drive is only responsible for opening the doors on the correct side. Depressingly, they don't even get that right sometimes (see Rail Accident Investigation Branch reports passim.)
When the DLR opened without drivers at all, many were 'cautious' shall we say. Now nobody bats an eyelid.
Actually, the DLR is an interesting example of how airlines could go. There are in fact driving positions under the locked covers at the end of the train; in the event of catastrophic failure the passenger-service agent (conductor) can use these to drive the train.
There's no reason planes couldn't be the same. They could all have a qualified pilot on board for emergencies - it's just that most of the time they'd be occupied with serving the snacks.