With regards pilotless aircraft, won’t happen until they are completely unhackable and unjammable, GPS is easily jammed or downgraded as anyone flying near Syria at the moment will know and computers are easily hacked, I just don’t see it happening the risks are just too high.
With regards single pilot operations, what training will the pilot need? Straight out of L3 with 300 hours onto a passenger jet? Or will they require let’s say 3-5 years of On The Job training sitting in a second seat in the flightdeck being called.. I don’t know a First Officer???