This isn't correct at all.
OLED doesn't require multiple manufacturers to remain a viable technology. It just needs to be profitable to the manufacturer(s) which use it. At this point, that is really just LG, but if they are making a profit, and the technology is favorable, then why would it die?
This isn't like HD DVD vs. Blu-ray Disc. It's not a competing, incompatible format. It's just another display technology that anyone can use with all their equipment.
Moreso, reviews indicate that the OLED displays are outperforming the LCD counterparts.
Yes, OLED is a premium product. About $2,000 for 55" and $3,000 for 65"... and upward.
So, you can get a cheaper LCD display no problem. For a quarter of the price even. Yep, $400 on the Best Buy website for entry level 55" LCD models.
But, they are LCDs and won't match the image quality. Plus, $2,000 isn't like the $5,000+ which the Pioneer Kuro plasmas used to run. Certainly people will buy 100 55" cheap flat panels for every OLED 55" display which is purchased, but the reviews support OLED as being a superior technology. As being the best technology since plasma disappeared. So, if people want top shelf image quality, they really only have one choice, and that comes in the form of OLED, and right now, that means LG.
While the OLED market may remain small, it's owned by LG at this point, and LG really is a very price competitive company. They aren't putting all their eggs into the basket of OLED, they have many other displays, and many other products they bank on. But, that really doesn't matter much. What matters is if they are making a profit on OLED, and if they can continue to do so. Unless you know something I don't, they could have a very long product lifespan with OLED.