While the lvl cap of Aby is nice at 30 and should stay that way I think SE could apply some abyssean effects to the "outside world"
IMO Non-Aby areas should receive something similar to:
Some form of atma system (not as strong but something intelligently implemented by SE)
Re-spawning of mobs should be equal to aby re-spawn rate
And maybe at least take a look at chains outside of aby and adjust to SEs liking. 1k XP for a chain 4 or so on colibri w/e would make some of the ppl who don't like aby feel like their time is being put to decent use.
Also they said that pretty soon they're looking at using a lot of synergy to upgrade equip, so who knows all that usukane you have layin around in your MH may turn out to be pretty sexy by the time we hit 99.
Lastly everyone who approves or disapproves of Abyssea and the current state of the game atm. Remember we're only level 90 (while many may say very unlikely) when 99 finally rolls around SE might unleash a juggernaut of content on all of Vana'diel. For all of the ppl that still want to play in the old zones you may just have to wait until 99 to see how SE fits everything together.