I am in complete agreement with you. I currently have a cache close to home that because of the location of the hide(it's on the ground, and most DNFs literally walk right on it), tends to be high-maintenance. I have tried to contact the owner (who does not respond) that I would be interested in adopting the cache, in order to prevent some of the maintenance issues (e.g. outdated online descriptions, full log books, compromised containers, etc), but no luck.
Looking at this person's hides, they have 42, but over half have been archived/disabled. So I'm thinking that this person has succumbed to the "no longer fun and too hard to maintain" stage of their geocaching careers. Of those that are still active, many have similar maintenance issues.
So does anyone have advice on how we can help these poor souls, or is there a formalized process to "adopt" a cache (or caches)? Due to the number of caches in my home area it's hard to find a new location to hide my own but I'd love to take over some of the neglected ones and maintain both the listings and the physical caches themselves.