I think business school is already disrupted with startup accelerators like YC. It's a matter of time before they realize it. Some accelerator programs even want a tuition. I've pondered this a lot thinking what I would learn to go to business school, but problem is that you can't get funding to start a company, but you can get funding to attend business school. Hence why business schools exist now. But 10-15 years from now this will change.