One of the biggest problems with the game is just how long it takes to get to max level, and the more you make new worlds, the more that number increases. If you're a casual player (1-4 hours a day, which is what most kids, who are the target audience, CAN play per day), it will take no less than 2-3 months to get to max, not counting getting gear/pets. And thats per character!
My proposition is to nerf a lot of arc 2 worlds, which will make it a lot quicker to speed through the game. Make bosses have a LOT less health, at least on par with arc 3 bosses. Make kill/kill&collect quests require less mobs, nerf mob health yadda yadda. This nerf was made to arc 1, so i dont understand why it shouldnt be made to arc 2.