If Microsoft did anything like that they would be flushing their 2.5 billion dollars down the drain. The community that surrounds Minecraft is why it's worth so much.
I've seen too many times in the past where big organizations do things that don't seem to be in their best interest. Microsoft is made up of many people and one VP may decide that short term profits for a quarter (which increases his bonus for the year) trumps the wellness of a community. And he'll rationalize his decision as being better for the community.