I didn't see any media go past those markers, except with a drone.
Did you? I'd really like to know if you did see that. I haven't been able to watch all the media. I saw exactly one reporter, one camera person, stopping at the yellow tags (just as I would do, if I had my Press hat on).
Blocking off a remote area like that is often unfeasible. I've been involved with potential crimes (dead people) in National Parks and, well, no, they don't do anything other than put up evidence tags and yellow tape for the long run. It's true that really unscrupulous people might trample (and maybe it's wrong that some revealed the mile marker for this), but I do believe press has been respectful, as they usually are.
I know of no examples where legitimate media trampled a crime scene. It's death to a career, if that's found out. It's also (in some cases), a crime. I have no idea if they have an officer stationed out there (wouldn't be surprised) or a sign at the side of the road where the crime scene begins (that one's tough, as crimes happen at roadsides all the time - tape gets put up, but roads are not closed). Most people do not stop and invade crime scenes, though.
I also figure that those yellow markers at the edge of the scene are not marking crucial evidence. The kinds of things that a forensic anthropologist or forensic geologist would look for cannot be "trampled" that easily. At the same time, the amount of evidence left behind is likely small - and mostly, they need good digital photographs, with angles and measurements, to be able to digitally reconstruct the scene, either for the jury - or just for the investigation.
The fact that they retrieved Suzanne's port is phenomenal. Soil analysis needs to be done (and those markers will help the people who guide the geologists out there). Geologists will "trample" as well, I guess. Those footprints in what appears to be recent mud may have plaster stuck in them, just in case. I suppose some crazy person could drive all the way out there and destroy those footprints, but I'm guessing there are trail cams all over.
JMO.