The world was not ready for youtube in the 1990's. So whoever tried it then was "wrong" (also called "before your time" - but just because you're a visionary doesn't mean you're right - if your timing is wrong, you are wrong)
If I build a company that leverages everyone's mobile gigabit internet connectivity in 2013, I will not succeed, I will fail, because I am wrong. If I build this in 5 or 10 years, well, maybe the world will be ready.
Many startups succeed because they are ignorant of the fact that what they are trying is impossible.