Blockchain network or infrastructure is secure by itself with sha256 encryption tech behind it. So i think blockchain tech can be used in all of the works where security is main concern like in data storage and financial systems/transaction.
"Blockchain" is just one element.
it does not need to be secure by sha256. it can be secured by any algo and still have features to chain blocks together.
it doesnt even need to rely on a second layer of security by having a second hash of specific difficulty(mining vs signing (POW/POS))
it doesnt even need to rely on distributed copies.
so when corporations remove the 10+ layers of security bitcoin has (keypairs, distribution, mining, etc, etc) just to use 1 layer of security. (the chain) its not as secure as bitcoin.
and businesses have different needs. EG how many employees have access to update a specific element of data(keypairs). how fast it needs to update(mining or signing), which all make blockchain a great utility but without the extra layers of security that bitcoin has as standard, should not be treated as secure as bitcoin
but with that said there are MANY, MANY uses corporations can find that can secure their data better and save them on maintenance costs..aswell as open new opportunities to do new things that they never considered before.