That may happen but not yet now because blockchain need to accepted in many countries so if ever it could happen that cryptocurrency could really boost banks.  We just have to trust that blockchain technology can be even more  effective bcause blockchain is really good, like fast transactions, low fees and you can use it anytime..So we hope someday that cryptocurrencies will be accepted in any country as a payment and loans etc.. trust,patience and determination then keep our spirit to spread the word of blockchain