I'm still waiting for notch to release Minecraft into the public domain as he said he would eventually do [1]...
[1] http://web.archive.org/web/20100301103851/http://www.minecra...
[1] http://web.archive.org/web/20100301103851/http://www.minecra...
I doubt Minecraft's sales are going to drop any time soon. And also, given that Microsoft owns it now, we might never see this anyway. Still something that we can look forward too, though.