hear are my thoughts:
the immediate possibilities include:
now imo, 4k isn't going to be worth it until it's no longer attached to edge-lit led backlights. I don't care what panel you put in front, if the backlight is garbage, the image is garbage. seems as though nobody wants to deal with the thickness and cost of full array led backlights anymore either. I don't think plasma will ever support 4k, nobody is putting any money into developing this as far as we know. this leaves oled as being the only way a 4k resolution is going to look good.
so if you're waiting for a good looking 4k tv, you've got to wait for not only 4k to become 'normal' on the leds, but 1080p oled to become 'cheap' too. imo, aside from minor improvements we'll see from Panasonic and Samsung on their excellent plasmas, it'll be closer to 10yrs before a new 'reference quality' 4k display is affordable(say under 5grand).
so for me, there isn't going to be a display tech that is worth buying over today's plasma screens until:
-OLED's support 4k resolution
-4k content is available at home
-screen sizes are min 80"
personally, I bought my 'big screen' plasma this year, and I intend to use it for 5-10yrs. I wanted to make sure I had a good tv to last me, I was afraid plasmas might go extinct and there wouldn't be a reasonable replacement. I was left in this situation when CRT's went off the market. I honestly didn't believe they would stop making them as long as they still gave the best picture. but there I was, babying my precious CRT for nearly 13yrs hoping it would last. I guess in a way it did, as the f8500 and vt60 are close enough on blacks, the only thing my old hitachi still had going for it was not having lag. but for a period of about 6years I kept an eye on the market and literally couldn't find one display that I preferred over my slowing failing crt. so, if anything, i'd be more worried about missing out on the opportunity to buy a really good display now, knowing that plasma's days on the market seem to be numbered. i'm sure at the first sign of failing oled sales, they'll stop making plasmas to force ppl into buying the oleds
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1018AH, 5.1 audio
Sources: HTPC(Mediabrowser), PS3, XBOX360, Wii, Sony DVP-CX995V
Control: Harmony One