Yes. There are innumerable topics and interests that don’t have a robust presence on Lemmy yet because the platform is just too small and niche. Lemmy is great for tech and tech-adjacent stuff but I still wander back to Reddit from time to time for sports, for instance.
Honestly the biggest long term threat to Lemmy is its technology not being able to keep up with its own success. Issues like bad moderation tools, spam, and fractured communities need to be addressed within the software platform itself.