Memes communities tend to be very popular
Maybe, but if it's limited in scope to memes about the Fediverse, the community might not exactly be overrun. Hardly anyone in the Fediverse memes the Fediverse, and outside the Fediverse where the huge majority of memes on Lemmy come from, nobody does.
That is, if such a community exists, maybe it'll drive people to meme the Fediverse in the first place.