It's a possibility. not a fact.
Well, currently there are 6.7 billion ~ 6.8 billion people in the world so....
Probably it could hold about 10 billion people's information, but think about how many websites/media/file/etc are there in the internet....
almost impossible to count... and there will be more since we are making more files when we post comments and etc...
It's the "Mathematical guessing game" (Probability, I call it that way because it IS a guessing game...)
And if it's like 6.7 million people and it's this much crowded in the world,
think how the earth is going to be able to hold the population that are about 13,000 times more than it is now....
Hmmmmm.
There won't be a thing called houses anymore. There will be apartments that are >10 floors... or even below floors....