Fact is that MK does not care about anything other than pleasing himself, because he is in a very unique situation. He made a huge fortune with DS and when it went too big for him, he stopped it. Nowadays, he would not get a record deal anymore, but he can live from DS fame.
Great for him, bad for us as we all have to live with compromise, especially at work, but not MK. As Guy said it is 100% Mark's decision. The new album should be called 'Got lucky'.
But at least we've got GF who is IMHO too good for this world...