You are right that bitcoin adoption is it's early stages. But due to the fact that it is so revolutionary and so much better than we currently have, I think adoption is just a question of time. The same happened about 20 years ago with the internet: as adoption increased to every household it created whole bunch of industries (lycos, altavista, yahoo, dotcoms, myspace, google, facebook, apple, android, online movies, online trading, work online, online everything), that all use internet as a base. That's why bitcoin is not just a ponzi scheme, but rather inevitable future.