Good point and we should spread the word as suggested.
There are still some hurdles that will lead to problems when mass migrations happen. Not from a technical point, as I understood the servers don't have any problem handle a lot of people, but from the community aspect.
FOMO, is always a considerable point when joining a instance. It must be clear that the instance is just the entry point into the fediverse and there is still access to the complete content.
fragmentation, while this is the whole point of the fediverse it could lead to missed chances when the critical mass for a sub is not reached as the community is spread over 10 gaming subs on different instances. A more easy process for subscription to interest groups that subscribe to all of the mentioned 10 gaming subs collected under language preferences. To solve this the apps used could support these features without the need to perform changes on the server side.
a standard set of communities should be there for available on every instance. But then moderation will be a problem as there is not one mod but 10 needed for the gaming example.
I think there is still a long way to go. While I am happy with what's there for now, bringing the people together under a fragmented structure will be the biggest challenge.
Maybe the kbin way will help as it collects the fediverse under one interface, no matter if lemmy, mastodon or whatsoever. The only problem is the account multiplication to join everything.