Only 64 players (for now at least) opens the door for a lot of dead servers.
Say you don't have a guild or real life friends playing. Like all games theirs a good chance most of the 64 will quit leaving you all alone !!...In fact even with Guilds or RL friends.
Is it a temporary game like 7 Days to Die ?.... A big difference between them is 7 Days to Die can stand as a solo game on it's own. It's a solo game first and foremost.
People are also fickle. They see 20 stop playing and they stop too.
What happens on weekday afternoons, and most of the 64 are at work ?
Players quitting is more common than not !