MagicManICT wrote:People have attention spans, those spans run out, and people get bored.
It's not only about attention span. There are two categories of game content: provided by game mechanics and player driven. The first is limited and tend to end. Technically, after you reached 5th cave level, killed a mammoth and a troll you sort of seen it all. You either restart again on another char in another place or keep quality grind and participate in player driven activities, which tend to be more long lasting.
So, the amount of technical game content is a factor too, I think. Usually games try to keep it up with updates but it's always a loosing race against how fast players consume new content.
MagicManICT wrote:What the other guys DON'T do is reset the world.
Unless it's a generated world. I don't know any _M_MO in a classical sense which uses it, but multiplayer games with procedural maps tend to rely on the fact that it's generated as part of their replay-ability.