Why buy the old games? If Nintendo is truly about pleasing the customer, they'll release an adapter to let you port your games right from the original cartridge to your Wii. The game could be verified your Wii's internet connection, and no game data would be transferred (besides release date, players, a screenshot, controls and console, for the menu view, and emulation) to prevent people finding ways to illegally download anything they want. It'd all be like ripping a CD with iTunes on a computer, except its... not.

I know I'd rather put all those NES and SNES cartridges in my basement to good use, rather than having to re-purchase everything I already own. I'm not the only one, I'm sure.