Well the thing is MS so far only has Gears and Halo as their current cash cows, and they made 343 industries just for the purpose of getting as much as they can (milking) the Halo series.
Turn 10 will obviously support the racing needs and I thought they were rumored to make a new PGR in the future.
MS this generation has felt timed exclusives serve a better purpose and getting all the companies to go multi (like getting Tekken, Virtua Fighter, Devil May Cry and FF13 amongst other games.)
It's just that simple.







