The only way the whole world will adapt to bitcoin is when bitcoin users are informing other people.
Easier said than done. With scams and wallet robberies occurring at such alarming frequencies, I find it increasingly difficult to convince ordinary people to use Bitcoins. When I started collecting the coins in 2012, it was not this difficult. But now it is getting a lot harder, especially with scandals such as the Mt Gox robbery and the Silk Road arrests.
That is the problem for the most people, as masses are used to having banks, financial institutions, payment processor which manage their money for customers.