It is not limited to Sony and Nintendo you know. Any other big name publisher can also buy them
. That includes all the companies like Capcom, SE, Namco and GungHo. Microsoft is prehaps the last company on earth to purchase them.
That's why, i am saying, keep dreaming that sweet dreams
P.S Microsoft already spent close to 1 billion on money hatting and exclusives, i doubt if they are gonna bother spending more on buying a company, which barely sells 200-300k copies in the west.