That is like saying sky is good and so much to do because it has 5 zones, no its one event
I would disagree with calling it "one event." THere's quests to complete, a storyline, a BCNM, NMs to kill, places to EXP... You didn't go to sky just for the event either... back in the day it was a popular place to EXP. But whether you call it "one event" or not, Abyssea has a lot of content, and a good amount of variation in that content. Yes, Abyssea changed things. But (mostly), they were good changes.

einherjar is one event (10 zones)
Einherjar is actually one zone.

abyssea is the first time ever we ran into one event outdating everything,
Dynamis outdated everything before it. Abyssea is what dynamis was when it was new.

Anyway... it's about quality more than anything else. The point was, abyssea isn't just a little bit of content. But as I said, we still have one or two more level caps to pass, and Abyssea is "done." Thus, we'll be doing something different or unique in a future version update, just as was the case with major updates after dynamis was finished, after assault was finished, etc.. I don't think this is something to be that worried about.