The only thing about WoW that intrigued me were the mounts and thats like the one thing that WoW has over GW. Even if they were all the same but in different colors, I would be happy
The one place this might screw the game up, however, is explioting the mounts and running skills by running much easier. This would be easily remedied by having mounts be entirely astetic but with a very slight movement speed advantage (so that you could outrun enemies) and a sort of stamina bar for the horse, when the bar got low then the horse would slow down.
So my question, I guess, is: Will there ever be mounts with future expansions?