Beagle 2 wasn't very big. It would only change a few pixels in a Mars Global Surveyor surface image. Dust devils are always changing the surface of Mars. If you do a before-and-after analysis of different photos, you'll have to filter out the noise created by dust devils. Some astronaut/colonist will have to actually find the pieces of Beagle 2 on Mars. Then an archeologist (with a lot of time on his hands) will have to go through the effort of putting Humpty-Dumpty back together again to figure why he fell (won't happen in our life time). A thousand years from now, Beagle 2's wreckage will make a nice exhibit in a Martian museum. Scholars specializing in ancient technology will amaze (or bore) their students by pontificating about Beagle 2.

Gary