I think there is not plenty of problems with crypto currencies it is pretty straight forward, I think it will not be to about the point of convincing people to use them or not but who wants to own them and how much exposure will they give to people. Most of the things we use now have been imposed on us so cryptos can as well. What if a big bank gets a hold of half of all the bitcoin and imposes it al lover the world. price will increase for him and people will use it. problems will arise but as long as it is supported by ppl up there all that will mean absolutely nothing. banks are a HUGE scam and people still uses them...