IMO, almost no chance of that.
The update will be called the

TV 5 "now with 4K" (but otherwise identical to this "4," much like the "3" was the "2" "now with 1080p").
You
buy the update, not get it for free via a software update.
And again, like the "3" update, it probably doesn't arrive until either with or soon after next year's iPads inherit this year's iPhone 4K camera. My guess is October 2016-March 2017 for the "5".
Magically, once Apple rolls out a 4K

TV, all the 4K bashing, all the "you can't see the difference", "the chart", etc arguments against 4K will just evaporate, replaced by "shut up and take my money". And apparently, the "whole internet will be upgraded to make 4K work for everyone" too. And so on. In other words (and again just like group sentiment before the "3") all this negativity putting down 4K will just cease as soon as Apple embraces it in this product. What you won't see is this crowd calling Apple stupid for embracing the "gimmick", "another version of 3D", "nobody can see the difference" and so on. Even now, Apple's embrace of 4K in just about every other product they offer doesn't get ripped by these same people. 4K is only "useless" here... in this ONE Apple product... because Apple chose to leave it out of this one thing.