It is not going to happen so soon
It is not going to happen soon because:
*We are still screaming on HF
*We are still using old fashioned FMS systems with an Atari processor
*CPDLC is being used for only 5%
*There is NO automated taxi system invented yet
*Political issues between certain ATC sectors and/or countries are numerous
*Overfly permits are still needed almost everywhere
*Mixing remote controlled flights with conventional flights is not favourable
*The risk of unlawful seizure of aircraft becomes higher
*How are all the poor countries going to pay for this
This is my list of arguments, but OK we will see how quick things develop and how quick the worldpeace will become a fact. My guess...never!