Ki spends months creating new worlds, when we have so many places in the old worlds that are not used. Instead of making a big new world, KI could make a small new world and send us around the spiral to do questing and collecting. Bringing all the worlds together would be great, It would bring life to the worlds that look so empty now a days and also give the lower level wizards help with some quest.
That's not a bad idea! Reminds me of when we went to the Arcanum for the first time. We went to Celestia and Zafaria. It wouldn't be a bad idea to do something like that again.
I would actually prefer that Wizard101 continues to receive new worlds. Pirate101 no longer receives content like new world updates anymore, so updates like that to Wizard101 gives the possibility those resources could be recycled for Pirate101.
Additionally, new systems (like Deckathalon, fishing, etc) and key bosses heavily make use of old worlds to bring new content to players. New dungeons in old worlds might be an interesting take, but one of the two KI MMOs needs to generate new scenery, animations, creatures, etc.
Finally, I don't think offering quests in old worlds will work. For example, gathering obsidian chests from each of the worlds for Ashley the Fire Tree in Dragonspyre use to be much longer with more old worlds to visit, but was shortened (likely because players didn't like doing it).
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