As I said, the Right Seat of an Airliner is the biggest revenue generator of all the seats onboard. Why would you remove it?
That's because in the future there won't be an steady, continuous supply of dreamers willing to fork out 30K Euros for P2F schemes, especially with deteriorating career prospects caused by increased automation. People starting out right now in their 20s could potentially have to endure 50 years in the industry if the retirement age rises to 70 or even 75, so the possibility of single pilot operations (and huge job losses) becomes very real. This is already happening in the US where the dropout rate for student pilots is about 70% to 80%, and one reason you could say for this is the diminishing return on investment of even a basic pilot's license, let alone P2F.
Plus you have to think about the motivations of the beancounters who are looking at cost reductions in the long run. Also they generally don't like pilots or unions.