They're Coming

Potential system was way after dual bladers. If I remember correctly, major patches went like this in kMS: Golden temple -> dual bladers -> hob king pq -> 7th anniversary -> potential system/chaos bosses.

Edit:
2/25: Dual bladers
3/31: Hob king pq
4/27: 7th anniversary
5/13: Potential system, follow command, chaos bosses
5/28: Artifact event
6/09: World cup event

There's still quite a long way to go, at least two and a half months, especially if hob king pq doesn't come next patch, which it probably won't.

Well... I'd say it's pretty clear that we won't be getting KMS 7th anniversary stuff here (aside from increased equip/scroll drop rates), so it probably really is two months like you say (assuming Hob King PQ isn't coming out in the same patch as DB). Then again, this is assuming Nexon doesn't have a month of pure event crap/NLC expansion somewhere in between.

I have no interest in creating a Dual Blader, so I guess I'll be getting as many 60% Blade scrolls as possible and see if I can make a crapton of money off the event.