^ I don't get it either.
How would losing MGS4 exclusivity degrade Sony's status as a dev/publisher?
It's not like Microsoft came down to take away MGS4 from the PS3's library. Now if Sony loses the actual franchise and MGS5 becomes 360 EXCLUSIVE, then we have a problem. But as long as the PS3 gets it, I don't see there being any reason to get upset.