I think the manufacturers have other plans for you
I had a nice 70" Sharp Aquos 3D HDTV for 2 years and was waiting for
the satellite service and the local news remote cameras and the rest of the content to
deliver consistently good HD picture quality, then bam! 4K makes it all obsolete before
it even shakes out. I got a replacement on warranty this summer and it is a Q+, which
is supposed to deliver upscaled HD content with more vertical resolution.
It's better than the 2 year old set in brightness, contrast, resolution and it is a 240 panel.
These specs are better than the 4K sets in everything but resolution of actual 4K material.
I love it and would never see the difference from real 4K from a proper viewing distance.
Next year, Sharp is promising better color on the new generation of 4K, which I would
welcome more than the 4K, so my set will be obsolete in that way.
There is no way to stay caught up with technology, which is the flip side of progress...