That would be one of the ways that I'd use the home functionality, but the categorisation would allow for more niche subjects than just generic local conversation, such as treasure hunting games or historical photos etc. Also, the nearby feature would make it more of a utility for travelling and sightseeing.
I think you're right in that uptake would be a challenge, but I personally think that would primarily be due to the paradox of not joining a community because it's empty. It's something that I mention in the article. I don't know if it's something that can be overcome, but I wouldn't mind giving it a go.