Quote from 4HeadTiger
Does anyone else remember how Nocte was able to get 30fps with a 1000 block view radius?
That's without any optimization. With a well optimized system, we could probably see people with high end systems actually playing with the 1600 block view radius that was used to make the screenshot for the new banner.
The only excuse that Mojang can actually make is "we can't be bothered", or "It will take effort to implement, and we think that effort would be better spent in other places". Of course, both of these excuses are probably ill-advised given the various advantages of the Cubic Chunks system.
This is probably true right now. Im sure Mojang is working on other thing or has promises to keep, like the Mod API. The best we can do now is hope this gets popular enough for Mojang to notice.