After reading the topic regarding to maximum skill levels, I thought that maybe some sort of \"Trascendence\" could be developed for character becoming increasingly superpowerfull.
When a character start becoming extremely powerfull, their corporeal abilities could change. They can slowly become an Entity, or a Low Divinity. Walking Demi Gods and the such. Then, instead of Guilds, actual Cults could be created around the character. These demi-gods would slowly gain specific abilities and properties, such as granting speciall powers to their worshipers.
That way, there could be real Holy Wars among cults (assuming people will join them for the benefits it may have), a sort of \"increased version\" of Guild Wars.
Members of a Cult would recieve benefits based on the power and properties of their Divinity: If the Divinity was a Red Way character, then something related to the Red Way would be the logic benefit, and red wizards will be atracted to the Cult.
And that should be retroactive. By this I mean that the power of the Divinity should vary depending on how many people actually worship him/her, and in their power. This way Divinities would strive to become the best of their kind, to be able to atract more worshipers and, therefore, more power.
And that would help a lot in controling the distribution of powers in the game. A common problem in some MMORPGs is that, sometime, major characters are teamed up in quite exclusive groups, taking too much of the game in too little hands. However, by this Cult system, Divinities would suddenly start opposing each other, since otherwise their power will dim.
This doesn\'t mean that Cults and Divinities would not be able to work together. If a superpowerfull Dark Divinity arrises andthreatens the otehr Divinities, less powerfull ones would need to join forces in order to oppose the Dark one.
This is a quite vague idea, but I belive that, if well worked, it could tunr into a quite interesting way of creating a real society and interesting background to teh game.