Everyone seems to assume that Google's dominant position could only be undermined via free market competition. In America, perhaps, but in whole-world perspect

Everyone seems to assume that Google's dominant position could only be undermined via free market competition. In America, perhaps, but in whole-world perspective, not necessarily. Google is having some anti-monopoly issues in European Union (not unlike Microsoft in the past), and Russia threatened to ban Google altogether. They always had a hard time in China, too - their services being suspended or blocked from time to time, their market share decreased several times over the years. So if we're talking about "what can happen in 10-20 years", then absolutely there is a possibility that Google's world dominance gets crushed by governments which gang up against it at some point rather than by competitors. And replacements will just fill the void.