let's give your opinion here !!
No, I don't think it is going to be ever possible that it can replace the banks. People will always rely to what the government is protecting. And many big investors and depositors will not going to rely to a decentralize crypto which doesn't have stable value. They don't want to risk their money with it, banks will remain and bitcoin can be adopted.
I think bitcoin bank replaces it especially hard because of the bitcoin transactions difficult to track, so there is still much to be improved bitcoin transaction system,. continues still many countries that do not recognize their own bitcoin