Okay, I'm not even done reading the thread and I got to chip in here to disagree with several posters above - CN as it stands right now would be a TERRIBLE place to move Korra onto. We don't even need to look too far to see why - remember what happened to the DC Nation block?
...You don't? Well, okay - time for a recent history lesson then.
DC Nation as one might have expected was a timeslot allocated to DC Comics related shows. The two flagship shows of that block (as I recall) were Young Justice and Green Lantern: The Animated Series. First, Young Justice's first season took over an entire year in the United States to air in full (while other countries finished three months earlier at least). Then, Green Lantern got pulled 10 hours from airdate and replaced with Riders of Berk and Johnny Test...after a two week hiatus. And were then told it would be back on the air in January...of next year. After that, both shows were effectively cancelled, to be replaced with Beware the Batman and Teen Titans Go! (another Batman cartoon and well...something respectively).
It didn't even end there.
The more comedy oriented TTG ended up almost effectively taking over the block, while Beware the Batman was pulled after eleven episodes, to be reran in January...or so we were told. It then moved to an "unspecified first half of 2014", with only two episodes appearing on a Blu-Ray until then. Eventually, it did reappear on Amazon Prime's streaming service in full (I am unaware if the likes of Netflix have the series), and Toonami have started showing the show in full in an early morning timeslot.
Combined with what happened with Symbionic Titan - why are we trying to get the show onto a channel that may well end up treating it just as badly, if not worse?
TL;DR: If not even BATMAN can air even one full, consistant, un-meddled with season on CN, what chance do you think Korra has against the powers of the CN executives?