re: A creepy thought...
I'm still pretty convinced that the rover could get back out of that crater though certainly not by going straight up any of the sides. A simple switchback route up one of the sides with the most gentle slope would make the climb a long one but minimize the angle of attack greatly. That method certainly worked when getting out of Eagle crater. The only threat to snaking back and forth on the way up would be the tendency of the craft to roll sideways but it certainly looks as if it is built with a low center of gravity. Doubt it would be a problem. Now the depth of dust at the bottom....? Who knows.