First off, they can make an interesting world without needing of jumping >.> look at FFXI
-People will jump around, it will bug the frick out of me and most people I know.
-This isn't a platformer, its an mmorpg, ya know, a simulator, kinda like for real lifeish
-Again, the world we live on RIGHT NOW, ya know earth, is suuuuper beautiful, you never have to jump.
-Again, not a big deal, takes 1 second to go around.
Swimming though, ya, I want that.