as a human being we can adopt to our surroundings. It only took us a day or two to become totally into bitcoins. It only took us 2 hours to set up our bitcoin wallet. All of the things about fiat and bitcoin can easily change. Just like you said, bitcoin is still young. It's too young for us to judge its potential. We're lucky to be the first ones in here since we are going to be the one that'll make most profits.
People are becoming more and more techy. Your parents might not be able to understand bitcoins maybe because they don't even know how to access the Internet but that will not matter after a generation or two when people are all well-versed about the technology and the Internet.
I totally agree, as time goes on the whole world is going toward becoming more and more digital, I mean look at us now we are using virtual reality and using digital money to buy food on the internet, and I think that in the future bitcoin is going to become the main used currency because everything will become digital, and the paper money with disappear.
decentralize is a decentralized and centralize will still remain as centralize.
This is the point, I believe into that the paper money will not find its survival against bitcoin ecosystem. Definitely in future people will choose a decentralized system over the centralized one.