I'd agree with that. My argument, ultimately, is not that there should be no Rangers in the park at all - or, even, on the mountain in general - but that they (all) should restrict their authority to those situations in which a person's behavior is truly compromising other peoples' safety. People sitting in places where they could be taken out by riders landing is a great example of this.
Something must be done, though - and this applies to the entire mountain - about Rangers overexerting their authority. This is something Camelback Rangers have a notorious reputation for, and it's something that I'd hate to see brought into the park because it seems to me like the park one of the places on the mountain that is, in this respect, the least tainted. What I'd like to see avoided in the park is the currently common situation observable on the Front Four: Rangers, in a group, standing on a main part of the trail picking people off for borderline Responsibility Code violations because they want some "Contacts".
If you're reasonable in your policing, as it seems you would be, I'd have no problem with it in itself. My worry is that this might attract some of the more pedantic Rangers into the park and lead, ultimately, to a frenzy of whistle-blowing and red-marker-waving that's already observable on some other parts of the mountain.
I'd like to keep those Rangers isolated to as few parts of the mountain as possible and then, ideally, do as you said - "police" them so that they conduct their authority more reasonably.