The game can barely draw the game's highly detailed worlds fast enough for the speeders we have now. There's no way they can make them much faster without you riding off into the matrix whenever you speed off on one.
Sorry, it's just not possible with this kind of game. Racing games cheat by not drawing out the entire world, leaving graphic holes in places where you cannot go, etc.. There is no way to use those kind of design cheats in a MMO built to this degree of detail.