No one did this because you can't currently pay for anything and everything in cryptocurrency..yet.

The list is growing though: https://99bitcoins.com/who-accepts-bitcoins-payment-companies-stores-take-bitcoins/

Banks can incorporate blockchain to their benefit, I think you mean cryptocurrencies being "pitted" against banks, and they're only competing with them if the most-used cryptocurrencies are decentralized. Long way to go before this is possible. Still too risky with vulnerable exchanges.