If we see pilotless planes, they may put them in under the guise of safety, but the reality is it's purely a cost cutting measure.
The technology is certainly there to have planes remotely controlled, with the pilot sitting on the ground. That said there is a range of questions which would need to be asked before you'd ever see me on such a commercial flight.
1. Where is the fail safe? What happens if there is a systems failure on board which would normally require a pilot to manually intervene?
2. What happens if the data link is interrupted? Bad weather and / or sun flares can play havoc with data comms, esp over long distances.
3. So far everything they have done still requires a pilot on the ground, what is to stop that pilot from making a human error?
4. As the article has already allured to, a hijacker wouldn't need to leave the comfort of their living room. I build secure systems for a living, I spend my life looking for angles to attack software with the intention of fixing that problem. I have yet to find a truly secure system with absolutely no attack vectors. Whilst I am sure that some of the best minds in the world would work on securing data transmissions between the ground and plane IT security is always a game of cat and mouse. A security expert will plug holes as fast as they find them, but all an attacker needs to do is find 1 weakness and despite all the best intentions of the security expert, the attacker has a way in. The best way of thinking about this is imagine a really big house with all the exterior doors and windows open. An IT security expert would be the person running around looking for open doors and windows, and who will close them when they find them, but the thief just needs to find 1 open window and no matter how many windows the security expert has closed, it's all for naught.
Right now, should a drone fail, it doesn't really matter from a preserving life point of view. Whilst a crash is expensive in terms that a drone is not cheap, there is no loss of life. Put 400 or so people up there and it becomes a whole different ball game.
For me, there is something comforting knowing that if something goes wrong, the person up front has an extremely vested self interest in resolving the problem, beyond just a reprimand or loss of job. It's an almost "we're all in this together" type feeling.