Personally, I don't like completely-open wiki-editing rights.
I do like a more prominent way for others to suggest edits, new info, and so forth.
Pages "owned" by someone who has been away from SP for more than a set amount of time should be reclaimed by SP and given to anyone who can improve them. I took over a number of AZ/NM pages from a non-participating member about a year ago. Just ask an elf. If the owner has been away for a year, for example, then tough for him/her.
To the fellow with the Adirondacks info: just ask an elf, I bet you'll get a bunch given over to you.