In my opinion, the reason why Russia discusses a bitcoin ban is btc give a possibility to transfer assets overseas conveniently and secretly for people who concern about the currency devaluation.
I'd like to buy things with btc because its convenience. But the exchange rate of btc is changing largely and there is a chance that btc cost very high in the future. Spend btc now maybe made me be the guy who ever bought a pizza with 10000 btc.