Samsung isn't the only company making OLED screens. LG is as well, and so are some Chinese and Japanese companies (a Chinese company just announced 3.5B US investment in a manufacturing facility coming online mid next year).
As for quality nothing can touch OLED - once you go see one of the Galaxy Tab S models in a Best Buy you won't want an LCD-based tablet ever again.
So I'm not sure what you think Apple will do - stay LCD forever, when manufacturers stop producing it? Or when it's not even as current as it is now (which isn't very since it's 25 year-old tech)?
Look at the comments on this LG OLED TV review - best TV picture they've ever seen.
http://www.cnet.com/products/lg-55ec9300/