Ready his comment again. It does not matter because Mojang still exists, it's just a Microsoft-owned company now. The contract and everything else related to the game is still property of Mojang, nothing has been transferred.
A court may well consider that becoming a wholly owned subsidiary would violate a license, despite being a distinct legal entity[1][2]. Especially when it's just an implied license with no actual agreed definition on both sides.
[1] Which is similar to what we're seeing with ARM vs Qualcomm and it should be interesting to see how that shakes out.
You’ve linked an article about a doctrine specific to patent law. Does not apply here. Also, it only speculates that it might be in issue in an acquisition of a subsidiary (vs. a direct merger).
