To resolve footprints, about 0.1 meters in size, you'd need a resolving angle about
:
resolving angle = 0.1 m/ 4 X 10(8) m = 3 X 10(-10) radians = 5/ 100,000 arc-seconds.
This seems way above the resolving ability of any telescope yet built. I would estimate best resolving power with adaptive/active optics would be 1/100 arc-seconds. This would be the diffraction limit for a single 10 m circular aperature, like Keck. (I would estimate with adaptive optics we should be able to reach somewhere in the ball-park of the theoretical limit).
The only solution I see is an optical interferometer . Maybe one of those upcoming planet searching telescope arrays will have this feature and will be able to see the footprints? The Terrestrial Planet Finder looks like somewhat of an interferometer array (but that might be IR which I don't think is useful for footprints, maybe for the lunar dune buggies). I doubt Buzz would have gotten so worked up and punched that guy if he really didn't land on moon.
