I don’t think it’ll die… but it is a community that needs to be built basically from the ground up, while both the Lemmy/fediverse backend technology and infrastructure are actively being developed. Reddit refugees who want a drop-in alternative to doomscroll will probably be the first to leave.

The success or failure will be determined by the number of people willing to make an effort to post. Whether Lemmy (or the fediverse in general) will exceed the numbers of other services… I doubt it, but we wouldn’t be here if we only cared about numbers.