For even a single pilot airline system to work will require a full pilotless backup system in case of the relatively common incidence of incapacitation. It will require the technology to ensure uninterrupted communications, near faultless infrastructure and basically error proof automated aircraft. It will cost trillions and trillions of dollars. There isn't a single government in the world that's going to outlay that cost. They can barely afford basic infrastructure at the moment.
And for what benefit? Out of an average 40 million scheduled flights a year last year and currently into this one we've got only one fatal jet crash that was due pilot error (flydubai) and less than a half dozen turboprop fatalities in some very remote regions of the world where automation probably wouldn't have helped. So with no benefit to safety there isn't any private company that would be willing to outlay the trillions required as well.
The only reason why some "experts" perpetuate this myth is to get their names in the media, or to get funding for their drone research programs. Don't feed the trolls