Realistically, what is the biggest franchise that Microsoft can buy out that would give them first place in console sales?

[nanorazor]

This whole thread is pretty stupid, MS buying game studios mostly lead to its demise eg. Rare Ltd., Ensemble Studios, Lionhead Studios etc. But making their own studios are much more reasonable for all. developers and customers and MS themselves. MS still need more money on making new game studios, its working well for MS so far they just need invest more in to them.