I'm not entirely convinced Apple really wanted Steve Jobs back. They really needed an operating system after the failure of Copland though.
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).
Interesting theory. Based on history and company performance (I don't have sources for this) Rometty's run as CEO has outlasted most expectations. This is definitely an interesting thought
IBM acquiring RedHat is a way to play in the cloud field, not to change the complete IBM Organisation, which is huge.