Well a panelist said that bitcoin and the other cryptocurrency don't meet the criteria of being a money and calling bitcoin a very lousy Currency it might be called an asset but not a very stable store of value, They might agree in the nature of bitcoin being unstable and always fluctuating but it can not be called as currency well some of they might not against bitcoin but some are doubting how bitcoin will work in the economy and how they can make in work as a currency.
I don't think these are doubts that only they have thought up, it's been spoken about many a time in this forum. Given the instability of bitcoin it is very limited to be used as a currency and second to that, as much as people consider the fixed supply to be a good thing it is actually not in terms of a country one day adopting it, money supply is greatly used by governments all over the world to stimulate their economies.