To be honest, as long as Microsoft keep handing out money for exclusives, timed exclusives and for previously exclusive titles to come to their system companies like Square-Enix are going to give them a lot of time and love. It's a business and they need money to keep themselves afloat. I don't think this is the end of exclusives from the company but we won't see them catering to just one or two systems anymore, mostly likely each system will have one or two exclusives followed by tons of multi plat stuff. Also I don't think FF versus XIII will go multi, I would like to think SE has a shred of dignity left.
Sony seem more interested in providing their fanbase with new franchises than using their money to secure the current 3rd party exclusives they do have. Where as MS is using their money to buy exclusives and not worrying about making anything new.
"The only dependable thing about the future is the uncertainty." - Amarant Coral
