These responses seem to ignore the point that this is a balancable value. We can trade off the number of players versus the number of active entities per player. I didn't say 10, 100, or 1000 was the answer.
However, world size is not connected to the number of players and entities - but an issue of generation time, player desity, bandwidth and caching. Making the worlds 100km x 100km is trivial todo, but all things being equal would greatly reduce player density.
But given the options of (say):
- 1 world with 1000 unique biomes and 1000km x 1000km, or
- 10 connected worlds each with 100 unique biomes per world and 100km x 100km, or
- 100 connected worlds each with 10 unique biomes per world and 10km x 10km.
Which do we prefer?
Do we want to planet hop and explore a universe, or biome / island(?) hop and explore a world.