I certainly don't regret buying Resident Evil 4 on the Gamecube; I played through it 5 times. T'was truely an awesome experience.
However, I was disappointed, and felt let down by Capcom, when I missed out on the PS2 extras, so news of the Wii Edition made me happy I'd get a chance to play Seperate Ways.
And the Wii controls are so well suited for RE4. I have played through the game twice and i'm well into a third...
I grabbed my Gamecube RE4 out the other day just to check out my saves; what weapsons I had, etc, etc and started playing a bit... and it felt HORRIBLE without the Wiimote aiming... It's been said before, but if RE5 doesn't make it too Wii, i'm not too sure I would enjoy it on the other two consoles after playing RE4:WE...