I know what building an MMO is like, having worked on one 10 years ago that was already 10 years old and still exists today (small audience though). Building something like these people are talking about requires more $ than a Marvel superhero movie to get anywhere. We could manage about 100 simultaneous players visible to each other in a reasonable time but no more; the internet is not fast enough to manage more tha…
Exactly, on the server side player interaction is an N² problem (where N is the number of players who are currently interacting). Each of N players need updates on the (N-1) other players they can see. And without strong in-game reasons not to, players will test the limits, no matter how efficient your code (see EVE where despite them making huge improvements to their servers and code as well as already using an extr…
Even if there were interactions between everyone, presumably you could still exploit locality, like: https://homes.cs.washington.edu/~pedrod/papers/aaai10b.pdf