I've probed a few times about making Quarry Park a CORP managed trail and have seen resistance from both sides of the fence and I think both sides have valid points. More than one person on the CORP leadership side have balked at the idea of associating the club with a park that has such a rogue reputation, and the riders don't want to suddenly be subjected to rules for building and maintenance when the organic building has been successful for longer than any of the other trails in the area have even existed.
CORP could do a lot of good for the park by working on the specific things that Dan has brought up (trash, trimming, sawing), but the ad-hoc development of trails has been working very well at QP for decades just doesn't fit in with the ethos of the club. If CORP gets involved there could be an enormous amount of friction with the riders/builders who are used to being able to experiment without having to develop a formal plan for every feature.
It may be the redheaded stepchild of mountain bike trails in the area but it is accessible, fun, challenging, and has a unique social vibe that you don't get at any other park. That little green space has been the first love of many local riders including some that have grown into very active club members (shout out to Tom Holaday) and it deserves some respect for that. Yea, some sketch things get built from time to time but they usually fade away and there is a weird natural balance that seems to keep the system in check; that doesn't line up with the authoritarian approach that CORP uses on it's trails, which is completely appropriate when the reputation of the club is on the line, but it's been working at QP for a long time and the freedom of those trials is arguably the reason they attract so many young riders.
In my mind it would be great if there could be a middle ground where QP gets a formal work day or two throughout the year but maybe wouldn't be 'owned' by CORP or at least subjected to the full rulebook that the rest of the trails have to adhere to.