The finance industry and others are moving to a blockchain, it has not yet been adopted in full or implemented.
my personal suspicion is that the finance industry will never find a use for a public blockchain. i've heard of people who've attended some of these professional conferences coming back with the impression that very few of the attendees knew anything about it and were there to look cool.
but that's ok because real people will force them to deal with it whether they like it or not.
I would be doing more research if I was you.
Not all blockchains have to be public.
Australian stock exchange currently testing new blockchain for trading -
http://www.afr.com/technology/asxs-blockchain-designed-to-help-competition-masters-20170524-gwbzqgETH backed by mulitple banks and finance industries -
http://www.coindesk.com/deloitte-blockchain-ethereum-alliance-hyperledger/etc etc etc