We should not be optimising Mastodon so it can handle more people per server. We should be optimising Mastodon so it incentivises more serves with fewer people.
(And if you take that line of thinking to its logical conclusion, you arrive at the idea behind the Small Web: https://ar.al/2020/08/07/what-is-the-small-web/)
@aral Smaller instances are more likely to die out. It's better to have fewer ( in dozens or so) instances that are more reliable, IMHO.
Thousands of servers just confuse people and make the network less efficient