I found the Massively Interview to be very interesting. My imagination started wandering.
Hmm. rather than having XP to level with, you would get imagination to spend on your character and environment, sort of like an alternative form of currant.
Perhaps levels would just go away. Perhaps we would wake up some morning to find we're all at the same level with some starting amount of imagination, still in possession of all our stuff and currants. It wouldn't exactly be like being reset, it's more like some aspect of the game would change dramatically and THAT would start from zero, or some starter number.
Perhaps your house exists independently of housing blocks, and you choose which housing block you want to place your house in.
Perhaps...