I think the community will be fine.

Years ago an app named Candid shut down which caused a pretty big uproar in that community. A lot of people panicked because there was no real alternative that featured post anonimity (basically you had an assigned username to a single post and you could start fresh in another). Lots of people migrated to reddit and others to discord and in the end people let go of their need to be fully anonymous.

Now with the Lemmy migration people don't even have to give up features this big and actually they are driven away by their hatred towards a platform, not by its non-existance so it can be more convenient even if there are some things we have to learn here.