I'm sure one OLED is out there will be other crap on the horizon...
if you don't by tech today for fear of something better tomorrow you'll never get to a point where you can buy anything.
My take on it... if there's something you own that you want to upgrade, figure out what you want to spend and just buy it... by all means do some research, if there's some new tech that comes out a month or two down the road then wait but for all intents and purposes it's usually not worth waiting.
new tech is always coming out.
I have a DLP projector, it's showing it's age and I quite often salivate over the newer projectors on the market now... but you know what, I like my projector, it's a hell of a lot better then the last one I had and it's a hell of a lot better then what most people have period. Sure newer projectors on the market completely mop the floor with it but the point is... six months to a year from now there will be new projectors that mop the floor with those... and six months to a year after that... and so on...
The point is when you're ready to upgrade and have the funds to do so... JUST DO IT and NEVER expect that what you're buying will be the last thing you ever own... when it comes time to upgrade that, then upgrade. it's a living process, items have life cycles, such is capitalism