these things take time! since we are talking about adoption. but it will eventually happen. for starters the smaller businesses will start accepting bitcoin as payment, then more people come in and eventually bigger ones like Amazon for example will start accepting bitcoin and by that time you can say bitcoin is "viral".

as for cryptocurrencies in general, they first need to work on being secure and usable so that they can have something to say in competition with bitcoin and also with other payment systems.