One thing I don't understand is the tech pundits' tendencies to implicitly imply that to build the next big company on the web, one needs to stop, kill, destroy

One thing I don't understand is the tech pundits' tendencies to implicitly imply that to build the next big company on the web, one needs to stop, kill, destroy, annihilate the last big Internet company. Why can't Facebook be an unstoppable juggernaut when it comes to building a social network and becoming a utility for social connections for most, if not all, people for a broad base of use cases and there still be another big Internet company emerge? Just like how Google is an unstoppable juggernaut when it comes to search and contextual text ads. Take location for example. There could possibly be a next big Internet company the likes of Google, Amazon, Facebook that emerges which owns the location+mobile space. One reason why everyone seems to worry whether Facebook is or is not an unstoppable juggernaut is that companies are linking location+mobile AND social networks. So they ponder incessantly whether Facebook can just switch on location and mobile services and wipe their startup off the face of the map. The thing is, maybe if they focus on location+mobile and make it work without the social aspect, then there is no worry about Facebook using its advantages in the social space to compete.