Why does everyone assume that when a high profile exec leaves a company that the company is going down, it's just daft? Microsoft is doing just fine without Moore and Sony likewise will do just fine without Harrison, it's not like there is only one person in the world capable of doing this sort of job.
People come and go from companies all the time, the only reason such a fuss is being kicked up over this (and likewise when Moore left Microsoft) is because these people are in the limelight. There are people as important as Harrison and Moore who have left Sony and Microsoft in the last couple of years and you don't hear a squeak about them on N4G.
Why?
Because no one person holds a company as big as Sony or Microsoft together single handedly and the world is full of highly qualified people who are desperate to step into their shoes when people like Phil Harrison or Peter Moore leave.
Honestly, I despair at the ignorance of some people on this site.
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