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At this point, I don't think there's a single MMO out there offering anything closely resembling a truly dynamic world that changes permanently due to player actions. Maybe a few in early stages of development claiming that they will provide that, but I've seen many games in development making grandiose claims that never saw the light of day.

I think the closest thing to that was probably Shadowbane, but strictly from a pvp perspective. Since guilds could build their cities anywhere and destroy each other's cities anytime, fighting over resources on the map. But guild politics, city building and destruction was the only thing you could change permanently there. That game had many other problems though, and is long gone.

That's why the single player Elder Scrolls games are so popular, they kinda offer parts of that experience in a single player format.

What Ryzom can offer though is very solid and dynamic story telling through the Event Team and live events. The core lore won't be changed, but players can have very meaningful impact on the outcome of the events and steer them any direction that doesn't break the lore and status quo. But that's more if you're into roleplaying.