The point is not to replace Google, but to change the rules so Google's strengths are neutralized. I didn't dream this up, it's straight from Clayton Christense

The point is not to replace Google, but to change the rules so Google's strengths are neutralized. I didn't dream this up, it's straight from Clayton Christensen. Since nobody knows what the next rule changes will take effect, anyone can be replaced insofar as any company can have only a limited number of strengths, no matter how much they're diversified.