I might be reacting on this a bit late, but oh well...
I'm playing here together with my friend casually, I mean like 2 times a week, because we both are adults with family, work, and other interests. We appreciate that we can play on a server that throws us back to a time when Aion was a lot of fun, and we could take our time to gear up, level crafting, make money etc. Sadly we really can't spend more time just a few hours per week. I assume there are other players like us (who are around age 30) who come here for the nostalgia, and also can't afford spending hours every day playing, and if they do, they might want to make it a quality time instead of doing dailies to grind for gears, then log off. Resetting their achievments would be a bit much...
From my experience... games start going downhill when they start catering to those few people who spend 10 hours playing a day, level/gear up in less than a week, then do nothing but sit in chat the whole day and complain about being bored. There's nothing we can do about them. IMO it's not normal to consume a game so fast and then expecting the games to adjust their content to these players, when there are also players who take their time, enjoy the scenery, do the quests or just do some casual crafting and whatnot.
So as for my opinion, I'm just hoping GoldAion will be around for a long time, because our casual playstyle won't make us rush through the game and get bored soon. There's still a lot of things we want to do, regardless if there will be any changes with a new EU server or not. I know this is not a direct answer on the question, I just wanted to share my own viewpoint to show that there are players like this too.