I think you are ignoring the condition on that sentence.
"Once sales start dying and a minimum time has passed, I will release the game source code as some kind of open source."
"Once sales start dying and a minimum time has passed, I will release the game source code as some kind of open source."
So he can release it as open source, to make good on what? Some "About" page he wrote fucking 4 years ago when Minecraft was nothing but a PC indie sleeper hit?
Get real.
Especially a promise to a community that throws him under the bus whenever something happens they don't like (even if he isn't involved)?
I don't think that is reasonable.