There seems to be a great buzz in the cryptocurrency scene right now with the pool of early adopters quite filled. The tech savvy persons are almost all into this field and with working concepts like TenX that your sister could understand, we are probably only 1-2 years away from going from early adopter phase to the early majority phase. It's going to be huge.
No wonder the Gold scene is heating up the Bitcoin vs 'precious' gold debate: https://steemit.com/bitcoin/@wekkel/bitcoin-vs-gold-debate-intensifies
Many of these critics have their own agendas they are pushing and also I think many of the critics don't really understand crypto. At least I often get that impression by the way they talk about crypto. They reveal their ignorance of what it is.
For example, what governments talk about needing to regulate Bitcoin. How exactly do they propose to do that? There isn't an office they can go to shut it down so how will they stop it or regulate it exactly?
The only weak point is at the exchanges where you go to buy or sell Bitcoin.