Do any significant number of people genuinely take Bitcoin to be the future of currency at this point?
No one is betting that the current version of Bitcoin is the future of currency. They are betting that the version of Bitcoin that exists in 20 or 30 years is the future of currency.
I don't think it'll replace currencies, but I think it will serve a purpose as a means to transfer value when authorities don't want you to transfer value.
Not saying if this is a good or bad thing, but it is a real value proposition.