Of course. In Japan for example if you can name a topic or activity, no matter how obscure, there will be an otaku (enthusiast) or even a club of otaku for it. What makes you think there will be less interest in obscure topics in the future?
And here in the West everything has a subreddit. I can only imagine the future holds even better, resilient ways for obscure topics to gather people like distributed forums and such.
