Wouldn't want to be stuck with an unusable "DX" (cropped frame) lens when that time comes.

The word on the 12-24mm Nikon DX zoom is that it's usable on 35mm film when zoomed out 16mm or wider. Of course, on your future 20mpixel camera of doom, you could always crop out the center of the image and have your super-wideangle image, just without all the pixels. In return, you save a bunch of weight.

See this review.