There is no argument here.
Pointless arguing over something no one really has a clue about because no one can predict the future.
Hundreds of years ago people would have found today's current advances in technology as being unbelievable so in a 100 or 200 or 300 years from now, no one really knows how far humanity will progress. Humans have come a long way in just the last 100 years and advances seem to be accelerating.
However, the argument about removing a level safety is valid and stands for now and the foreseeable future. There is no Artificial Intelligence (AI) that is able to be the Safety catch that pilots provide and yes if you remove pilots then what you are in affect saying is that profits are more important than passenger safety.
That is the bottom line. It also is anti-intuitive on where the Aviation Industry has built its foundations upon. Despite what people think, Aviation has developed a phenomenal balance and a safety system that is the envy of all other industries. We at this point in time place a very big emphasis on safety. We are the safest industry on the planet, even ahead of the medical Profession by a long shot.
There are always 2 sides to an Aviation Company or business. You have the executives, the bean counters, accountants, business development managers, and share holders and the operations departments, who sometimes fail to see or forget that their companies safety record and reputation is a bankable commodity which translates to share price. They are profit centric. They are the capitalists in the company. Has anyone noticed the drop in the Boeing Share price? It will recover I am sure but this is what happens when the bean counters have their way and cut a small corner for extra profit. They also cut away a corner of the safety model that has been put in place. If it backfires, then there are no profits, just loss of life and loss of several Billions of Dollars (now is the time to buy Boeing shares). So safety costs money, but its also a valuable commodity too.
The other side of the ledger are the pilots, engineers, technicians and maintainers. These guys usually push back against the bean counters in order to maintain their standards, maintain the fleet, train pilots and conduct flights in absolute safety and without contravening the regulations.
So you can imagine, these 2 sides are in perpetual tug of war. One side wants to cut costs and chase profits, and conduct revenue flights even when it may be unsafe to so, or even illegal. Every pilot is asked by their company to do illegal stuff. Even in reputable companies. People play dumb and turn a blind eye, hoping that the Captain is mission centric, or will tow the line. When the Captain does not toe the line, then the buck stops right there.
The crew however are the filter. It's the Captain's license on the line as well. And the executives can't interfere with the Captain's decision. The Captain is the CEO of the aircraft. Ultimate responsibility for safety falls at their feet.
So shhhhhh! Don't tell anyone. But the advocates of single pilot are profit orientated. Pilots are not. The regulators like FAA and EASA or CASA are not either.
And the problem here is that they would need to certify such an operation. At the moment there is a regulation that all Regular Public Transport operation on aircraft greater than 5700 KG is multi crew.
Chances of that piece of legislation being repealed is ZERO - unless they can develop some form of AI or computer that is able to make Threat and Error management decisions and push back on the commercial forces of an airline, otherwise you are reducing safety and there will be more crashes and more people being killed for the dollar. That is just the way it is. I don't believe the regulator (FAA) will go for it. What is happening here is that we are putting a cost of safety. Safety is AOK as long as it doesn't cost which actually means profits first, safety second.
If you have pilotless planes, who is making those decisions about thunderstorms, wind shear or aircraft performance and serviceability? Do you want a human pilot who wants to live, or some form of programmable AI super computer that will put profit ahead of reason? Will we ever develop AI that is capable of reason and risk assessment in a very fluid environment? Star Trek doesn't seem to think so.
We still have a Captain Kirk on the Starship Enterprise who wasn't a very good captain btw. Later on we had Captain Think of the KLM narcissist at Teneriffe!
Later we had Captain Jean-Luc Picard who would make the ideal Airline Captain. He got the best out of his entire team. He consulted, weighed up his options carefully and made decisions carefully. The Airline Industries Crew Resource Management ideals were adopted by Star Trek, finally! A great example of Airmanship, discipline, professionalism and Threat and Error management.
You would have thought they would have been miles ahead since Star trek was in the year 2500 or something. But apparently not. They were like back in the 60s.