>>724804731 (OP)
MMOs died for two main reasons
Want to make a big MMO? Well, the type of staff and infrastructure required to keep it alive could also instead be used for live service MTX trash, often requiring less overhead and paying out a lot more, so no publisher really wants to greenlight such a project anymore. To them, it's leaving money on the table.
Want to make a small MMO? Well, the smaller world scope and servers quickly encroaches on similar design principles behind open world survival craft slop that players can individually host themselves, and if you aim for that instead, then you can completely eliminate overhead and erase a lot of the players' worries about whether there'll be enough people to populate the game.