Google will inevitably become a blundering bureaucracy like every behemoth before it. The inevitable corporate politics will cause it to crumble from within. My bet is Chinese companies will outmaneuver Google outside western markets (US and EU). Also, Google is primarily an ad display company. Global marketing firms should support competitors to blunt Google’s dominance, especially outside the US. Finally, the EU will declare Google a monopoly. All this will take a long time though, just like Microsoft.