Earlier quoted context omitted.
The problem is that people complain but many then go ahead and book the cheapest flight whether it's to save their own money or to comply with corporate travel policies. I'm not sure what "disruption" you have in mind that isn't available to existing carriers.
This is the key. People complain about the airlines, but they're only giving their customers what the customers want. Sure, nobody says they'd rather be crammed into terrible seats and treated horribly to save $50, but that's how people behave, and that's all that counts. Next time you're eating your terrible free pretzels with your knees in the back of the person before you, don't blame the airline, blame your fello…
If you want to make a capitalist argument then you also need to accept that customers also have the right to complain about the service they receive. It's part of the market. None of this "it's your own fault" bullshit when it's the airline that's installing the seats.