Probably, it is a free map and available to easily download from the wiki site.
... the biggest challenge is 'Awareness that this exists'. Perhaps there is a better way to make the casual viewers who search for free maps to find this site?
Although I have never geocached, nor do i understand the purpose of it :) .. imo

I'm using osm with geocaching. It's just a great help!

I try to leave OSM goodies in caches. Things like printed maps, CDs/USB sticks with pre-compiled Garmin maps etc.

I am using OSM maps for geocaching, but I have to admit that I dont need the OSM map in my Garmin GPS for the geocaching, but rather for using un mapped roads when going to the cache location.

Besides the OSM maps I also load other free maps of smaller local areas when available.