forget all delusions of banks using bitcoin.

they are going for hyperledger.
as for the utility of hyperledger.

its much like going from Database Management Systems DMS (decades old) to Relational Database Management Systems RDMS (still pre millenium but newer) where they were able to do more with their data.
blockchain is just a new layer ontop of RDBMS... lets call it BRDBMS.

where not only can they play with the data within the database tables that had relationship ties (quasi-blocks) like they did before. but now they can play around with the database itself by not having it locked in a central server needing a master key.

they can distribute it, lay out the tables (blocks) in different order and or location. change how its secured.

bitcoin does have atleast 10 different secure/feature mechanisms ontop of the old RDMS and its thought hyper ledger has just 4 extra ontop of RDMS, so more secure then older systems, but still not as secure/brilliant as bitcoin.

but because the bankers dont need it as a fully public accessible system and they cannot fully own bitcoin outright or 'efficiently' do the extra secure stuff bitcoin does (PoW to name one) they will just make their own. which they have been doing.

as for how/why/what
thats the big bank secret question about (smart)contracts of: money creation, notaries, equities, collateral, asset creation, etc

but they are saving money by distributing their ledger. imagine it. each bank branch has its own sidechain. thus less or no need of a skyscraper with servers and hundreds of staff monitoring it for security. due to the decentralised nature securing each bank branch.
yes its not 100% public..

plus the smart contract ability due to changing to programmable databases (in laymens) allows them to do smart contracts. that are programmatically determined. rather than a simply photocopy of old contracts that are human determined.

though i dont like what banks do. i can understand why they are doing it. and it seems it will surprise you too. so dont down play what banks have in mind as a 'head in sand' attempt to think bitcoin is going to kill fiat.

first of all.. imagine it this way.
no more 900 servers in one building.. but 900 servers scattered over 900 locations.. infact due to distribution it will be 95000 systems. so hardware manufacturers wont lose out. intel/IBM are actually loving it.

secondly less staff is a good thing for banks. they dont care about people. they would be happy to sack people

as for banking experts. they hir developers. and the developers understand it.
the term blockchain is very loose, but does offer many things. bitcoin is 10+ layers deep above blockchain. bankers so far are 4 layers. but compared to their old systems they do see benefits not just about the distribution but the programming ability it opens up that DMS didnt offer and RDMS was limited of.

just dont b surprised on how much they will screw customers into smart contracts in the future

No, the effectiveness and efficiency of block-chain technology on maintaining records with tracks will definitely help any institution to make/save money. But this does not mean they are going to use bitcoins but they are intending to use only the core technology of bitcoin ecosystem.

That is why i said they were still learning about blockchains technology and there is problem with bitcoins core about the block size and the Segwit still not be actived because it is be rejected by miners.

I think didn't read the title, i will make it bold hopelly it is clear do you think blockchain of bitcoins is worth for finance institutions make money.
It is mean i made question and not just copy-paste, and my source is not from there, it is come from my email notification and asking about it because of not complete the data.