To quote myself from the article linked above "The only icing on this cake is that there is a huge amount of fantastic stuff in the ground, and not deep at all. It is there, quite shallow, just under or near that thing you discriminated out. If we could see through discriminated items rather than be blocked by them an amazing amount of stuff would come to light."
Discrimination is my best friend, or at least the people that employ it, because it means things remain to be found. The only ground that scares me is ground where no targets can be found at all. As long as trash remains, there is hope.