The price of scrap metal has gone way down, so it's almost not worth it for tweakers anymore (they'd rather be stealing mail and credit cards now). That being said, I'm sure one of 'em will come get it once they know it's there.
As for the area off of Viscera Springs Road - that's all BLM land. In the past, the BLM has been receptive to organized cleanups in other areas, and has provided roll-off bins for garbage and rangers for safety and to keep unwanted folks out of the area while it's clenaed up (just look on CalGuns - they do it all the time).
If someone reaches out to the local BLM field office (Palm Springs, I think?), they might be willing to go to that lenght as well. I'm confident we could fill up a 40' roll off. I found two or three different shooting spots back there when my little bro and I were exploring a few weeks ago, and those few spots alone had enough junk to do it.
Anyway, this looks like an amazing trip and I'm sorry I had to bail at the last minute everyone. Stupid work.