It's hard for me to imagine Cook taking over Nvidia unless it was strictly temporary. I get the impression Cook retired because he wanted to relax and enjoy his golden years. But I agree he'd be a good choice to manage the chaos at Nvidia.
I don’t think Tim Cook would even give the time of the day to the Nvidia board or recruiters. He can bear and hold a grudge for a long time, similar to Steve Jobs. His firing of Scott Forstall and Apple’s dissociation with Nvidia after its GPUs failed in Macs are just two examples.
There’s a rumor that Apple’s Johny Srouji may be tapped to be Nvidia’s CEO. But I’m guessing Apple will do whatever it takes to retain him.
I got the same impression about Cook's retirement. But experience leading a trillion-dollar company is not a credential every executive has.
I'm not saying this will happen, just mentioning that it would be interesting to see it happen.