Is that it for the NLC Content?

This is the way I would have revamped Phantom Forest + CWK:
I'd have turned Phantom Forest + CWM area into a theme dungeon, with the quests reinstated, but in a sequence, rather than all at once. I'd make Bigfoot have his own map you can fight him in as the boss of Phantom Forest, and maybe Master Guardian as the boss of Crimsonwood Mountains. Also, the Twisted Soldiers would only be found inside the Keep, and there would be a pirate soldier included.
Those are my ideas. I'm not saying it's gonna happen, but I would enjoy it.

That'd have been the most logical way to revamp it.

But we do know Nexon doesn't like logic.

The original CWK content was the best NLC content ever. Just felt epic. And typhon egg farming was the best, almost as cool as the 1.5 week Loki Chest farming back in 2007 (before the range was raised so it was impossible to even hit a chest without being knocked off map and 3800 dmg=instant death for many=probably the WORST nerf ever in the history of maplestory).

Was depressing to reach the end of the quest tree, when you just wanted more, more more...krakian backhistory, versalmas warps, more Grandmaster lore, etc...(would have been MUCH better (best update ever) if CWKPQ had come out during the same CWK patch together.

Original NLC was only good for 3 things: 1) pots, 2) bombers (before nerf), 3) wolf spiders (back when ilbis were extremely viable and NX was like 1:2)

Gone are the good times of Masteria. We'll probably never see anything like that ever again.