photo-sharing apps are the next geolocation apps.
While they may be new as phone apps (as opposed to web apps), people have been sharing photos in a million different locations and ways for years (Twitter, Flickr, Facebook, Snapfish, OFoto, MobileMe, Picasa, Email...).
As it stands right now, I can't see Path solving any problem for me that isn't more easily solved by any number of already existing and wildly more pervasive tools.