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I bite: NeXT/Apple and Pixar/Disney. I wonder if RedHat management could take over IBM...
Nope they couldn't. Apple acquiring NeXT was to acquire Steve Jobs and making NeXT the foundation of the company. IBM acquiring RedHat is a way to play in the cloud field, not to change the complete IBM Organisation, which is huge.
If IBM shareholders think that the future of IBM is the cloud, and that RedHat is the cloud at IBM, I would not be entirely surprised for Jim Whitehurst to replace Ginni Rometty a couple years down the road... 100% speculation from very very far away (I don't pay for anything from either IBM or RedHat).