Yeah - this is the usual Microsoft playbook. Buy them out and shut them down.
The trouble with games though is: the back catalogue isn't worth much. Microsoft can by Blizzard/Activision/etc..etc... but they will only make their money back if *future* games are popular.
So... who benefits the most? Microsoft or all those indie companies who are going to take the place of the old third-party game developers?
Also - the usual arrogant lack of understanding about how Japanese companies work. They never sell out.