Came across this thread.
I myself wouldn't do 105" even if, but 65 - 78 might be ok for the average home.
As for curved screens...
If you notice in a movie theater, the screen is curved.
Newer, more modern theaters, that is.
And all the theater seating is contained within the "curve".
If you stick up a curved screen in a living room where seating is outside of the curve, that kinda defeats the purpose of a curved screen.
Now, as for 4K content.
True, little is available.
DirecTV claims 4K, but their current satellite(s) can not support much 4K.
The new DirecTV satellite that will expand their 4K has not yet went online.
Not until middle 2015 will that new DirecTV satellite fire up with 4K.
Because of current limitations with DirecTV satellites and 4K, little is offered.
Most of the DirecTV 4K content is the same content offered on the 4K media player from Samsung, and now that 4K player is tossed in FREE with most Samsung 4K televisions sold.
4K is going to catch probably sooner than later, especially if DirecTV lives up to its 4K promise once their new satellite goes online mid 2015.
And with new technology coming in televisions, such as OLED tv's, 4K will look better and better.
Technology changes so rapidly with TV, but 4K will be here for sometime to come once it catches on. Naturally, manufactures will need some new technologically gimmick to keep selling their TV's, 4K as the answer. Manufacturers will insist media providers do their part in offering 4K.
At least for the coming 5+ years the 4K trend will dominate the television market.
TV's will get better at displaying content at higher resolutions beyond 1080p, and that will require content with the matching higher resolution to keep up with the new TV's offered.
On one side you have OLED, then you have UHD TV from the other side.
Both look great when displaying 4K content.
And who knows what manufacturers have in mind next?
But 1080p will phase out, replaced by 4K.
The question is, what technology will your new TV have for displaying that 4K?