Multi-Genre MMORPG

There are ton of Massively Multiplayer Online Games out there, but they all seem to be roughly the same thing. Third person view of your character running around and slowly leveling up. What I propose is a game that is essentially many different games depending on what you like to do. For example, in a science fiction world, (probably the best choice for this) If you play as a soldier, the game changes to a first person Halo-style shooter, with you playing alongside and against other players. Veterans however, stay off the battlefield and instead direct lower level troops like a real time strategy game. Or an engineer onboard a spaceship might have to play puzzle games to fix machinery that has been damaged in combat. (see link for example) Other occupations may resemble other games, for instance, a thief can essentially play the game like Grand Theft Auto, courier jobs play like a racing game, Assassins work like Splinter Cell and other stealth games, etc. This would provide a lot of varied gameplay. Also, military campaigns would force teamwork from a vast amount of players that won't all know each other, like in the real army. This would also make battles much more difficult to predict. The enemy force may have twice as many troops as you, but if your soldiers are sufficiently 1337, they could certainly prevail against bad players. Extra incentive to perform well come if rank advancements are decided by higher level peers instead of the computer. I haven't done much research into the vast amount of MMORPGs out there, but I'm pretty sure there aren't any that cover this broad a spectrum, and let the game evolve with you.