Yep, but the ball is already rolling. If you mostly use the big subs the present, post-API-crisis Lemmy will work just about as well for you, and every time another user is added it makes it more viable. Probably at a rate of over one potential user per user added.

Plus, unlike traditional social media, it's not a monolith and can't really die. Either Reddit lasts forever or Lemmy takes it's place eventually.