It will take more than a year for people to use bitcoins I've seen many people still doesn't even know how to use bitcoins or how to use wallet or maybe they're afraid to loose money as bitcoin is digital currency you can't blame anyone if your bitcoin is lost so it will take some time.
To proof you wrong
I started using bitcoin after 2-3 weeks when i knew about it.
But it varies for different people.
However you cannot predict 100% true