Steve Jobs, in his second coming, did not try to win the PC wars. Instead he declared the PC wars are over, and Microsoft won. Google won the search war, it's pretty much over.
Mayer should look beyond. The local and mobile wars are not over. The social war is also not fully over.
Search can not be shut down, that's there. It is a key web function. But it would be a major resource swamp to try to take the lead there. It's just not possible, and Mayer would know.
Unless there is a way to fundamentally reinvent search. I don't think Mayer would be that inventor, and the best engineers in search are already with Google.
Never say never, but I hope Mayer is not having major thoughts on search.
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