External PCI-Express?

Imagine a small port on the side of your notebook that looks like a USB port, but a bit bigger. Imagine buying a 3 lb tablet PC that is good for pretty much everything but playing games. Obviously, you dont want to have to spend another $2000 to buy a PC that can play games relatively well, so what do you do? You buy an external graphics card. One cable plugs into the laptop, one plugs into the wall, and one plugs into the optional second monitor. The card, while pretty portable, is meant to be stationary. So, you go out and do your work on a really light, sleek, sexy notebook, and then come home, plug into the graphics card, and start playing Crysis or some other PC game that requires a ton of graphics processing power. Since the card is external, it wouldnt be that hard to put a passive cooling device in it, wouldn't take up that much room, and future versions could even incorporate a battery for on-the go gaming and even a version that wouldn't require rebooting, which is fashionable even now when you look at some of the notebooks out there that can switch between an IGP for battery life and a dedicated card for better performance. The port on the side of the notebook is basically a direct jack into the notebook's PCI-Express bus.

So why not?

fiber optic cable mb?