nevermind, the community can grow bigger and help with the development of the game. It could be 3D in the future, for example. I'm starting to like these concepts. Instead of waiting for some games to adpot crypto currencies, let's integrate them into the game from the very beginning, make the game fun to play and the word will spread among people who like playing games (a lot of them).
also 3D games can be botted. just look at wow or diablo3, where a lot of bot software can be found...
just buy a few computers and let a bot program run and you have your 51% attack
edit:
don't understand me wrong, i also like the idea, but it has problems...