You do realize that you are talking out of your neck, right?
Did you even read the article linked? 4K is little more than a buzzword right now. When the new hotness is still the price of a car or is just a prototype that you can't touch, it isn't a factor yet. OLED can be put into production right now at 1080p because there is already an industry to support it. There is exactly ZERO existing support for 4K at this time, so it is vaporware no matter what display format they put it on. Will it eventually be what everyone has at home? Maybe, but probably not in the next year.
4K requires different equipment to manufacture than current displays, so they build or revamp a plant to manufacture it. It is essentially considered a different technology even though both the displays and the equipment they are manufactured on are just evolutions of current technology/equipment. If you can't produce it on the old equipment, a new plant or all new equipment is what needs to happen. OLED is the same: new plants, new equipment, different technology, but the same business strategy. Companies will go with the tech that is the lowest cost to produce and sells at a premium; aka, whatever has the highest profit margin.
To drive prices down, you need equipment and plants to produce that technology, regardless of what it is. In other words, if you can't make a lot of it quickly and cheaply, the price won't come down; especially if there is a demand for it. Since I can actually see what the companies that manufacture the displays are ordering, it isn't too hard to see the direction the industry is moving. The plans for large scale industries like this happen
years before you see a product on the market. In the last 13 years I have worked with and for two of the largest suppliers of equipment for the display industry, so it is likely that one or more products that you use daily (phone, flat panel TV or computer monitor, etc...) were manufactured on the equipment I helped create.