These banks, mostly medium to large-sized institutions, are focusing their blockchain technology on three areas: consumer lending, retail payments, and reference data, which refers to the real-time information sharing of transactions across business divisions and institutions.
In four years, IBM says that 66% percent of banks expect to have blockchain in commercial production and at scale.
I don`t believe that banks will adopt blockchain.
About buying bitcoin,i think that the btc price will go down after the end of December.
For Christmas the btc price always goes up for a short period of time.