It... wouldn't. It wouldn't be one game.
A thing I like about the gaming industry is that, even if it's far and few, the variation between developers and games themselves creates a diversity that you just can't have with one game.
Then again one game would be a lot less expensive. Then again I don't visualize money very well.
This is definitely why I like games like Blockland, which was especially diverse in its earlier years. It was amazing. There was always something new, and I distinctly remember actually saying that out loud.
