Samsung is the only producer of screens that can meet the quality and quantity requirements of apple. I remember hearing they even had problems keeping up with the demand. I seriously doubt Apple could come up with another supplier.
I wonder if this will actually end up hurting Apple's bottom line in the end. Samsung is one of Apples largest hardware providers and one of the few that can produce screens of sufficient resolution for Apple's retina displays. Wouldn't be surprised if Samsung recoups their loses just by raising their hardware prices.
Apple wouldn't exist if a Montesquieu like separation of powers had been applied to the industry. Apple has always had seamless control of their product, it's what differentiates and makes them successful as a company.