According to MIDiA Research senior analyst Karol Severin, it wouldn’t be financially sound for Microsoft to make Activision Blizzard games true exclusives, and they might opt for a softer approach instead.
Severin also believes Sony would do well to respond with a big acquisition, even though that will be tough to accomplish.
Source: N4G PC Analyst: It's Not Financially Sound for Microsoft to Make Activision Blizzard Games Exclusives