you know i was clearly talking in terms of AAA titles as i mentioned later in the post. Obviously the PS4 is it is could render simple games in 4k...
1 thing I know is 720P games look better than the sd games & that it would take more work to get a SD (640 x 480 or lower) game to look good enough for it to be worth the effort of making a SD game instead of a 720P game.
I also know that 8MP pictures look a lot nicer than 2MP pictures when taking with the same camera.
Where am I going with this? You say no AAA titles will be 4K but how are you gauging what a AAA title is? if you're going by visuals & the games look better on the PS4K at 4K with some things turned down can you say that it's not a AAA title?
You can use cheaper AA solutions & other things.