My 2010 MacBook hasn't discoloured.You read my mind. I remember the ’good old days’ of the white iBook and MacBook (pour one out for the BlackBook). The biggest problem with those was the discoloration and dirt on the white palm rests and keyboards.
I was set on the white too, then decided to go back to black. I’ve had a black keyboard for 2.5 years with my 11” and it still looks good, so I’ll be sticking with black