How much does Notch have to do with Minecraft these days? I thought it he was working on his space game.
And his space game has apparently been on hold for months.
But I believe that Notch and his partners still make all the calls for the company at large. While his declaration seems a bit brusque, I think the Mojang guys have quite a bit of pride in being an independent company that has done well and may wish to clearly make their corporate philosophy known.
Even with that aside, he's a massive figure in the game development community. A lot of people respect him and look up to him for making out huge in the Indie game in industry pretty much of his own accord. His opinion is pivotal.