The Cons of AT Core will kill off the little population Warsong already has
This idea of removing things like quests and proffs will lead the realm to become terribly boring and dry. Sure, it will be fun for like a week. Then you will see people slowly abandoning the realm. This would have been a great idea if Warsong started as an AT Core, but players and guilds have adapted to this current realm.
But;
A good solution would be to keep the achievement/quest/profession system the way it is, and add the Positives as explained by Malaco.