It is far from getting to that point. That will happen when it become mainstream enough to attract normies. Lemmy could still use a lot of growth. I only get to consume content that happens to be available here, rather than being able to pick niche communities being active on the topics I would like.
I agree with the sentiment, when things get too popular every sub becomes more generic and filled with recycled or low effort content. But there's a happy medium. It would be nice if there were enough people that some more niche communities had activity.