@jon Focus on the user and the NAMESPACE.
While mastodon.social is likely to continue using the Mastodon, ActivityPub federation is agnostic to which app the user accesses their account and the namespace (instance) may migrate from mastodon to another application.
@jonahstein right, but the namespace becomes secondary. There's no longer the decision to choose Twitter over another, which has been the norm up to this point. Media can be agnostic.