I would disagree with the implication that everything has to grow, but solely on the grounds that I am not convinced human beings are psychologically mature enough as a species to be that connected with that many other humans and still retain their capacity for acting like a a good human.

The federated networks I am part of are pretty small and we have a lovely time sharing diverse interests, getting to know each other and even disagreeing sometimes without the blind hate, persistent negativity and gotch'a seeking you typically find on places like Facebook, Twitter and Reddit. Too much growth too quickly would destroy that, turning those small federated networks into another cesspool of bad behavior.

However, I am open to hearing why people disagree. My personal experience drives my opinion, so ymmv.