It's not like Wall Street would want to use monero for any reason because why should they care about the anonymity of the transactions, and I wouldn't really see Wall Street wanting to put it in the market because, well, they want to keep S & P all fiat based.
Pretend you and me want to enter a contract that neither of us can back out of, and that we want to keep totally private until a later time. For example, pretend that we are both mega-entities that believe the price of a certain asset will move soon. I think it will go up, and you think it will go down. We know that
if the public knows that we are betting it will change the outcome because the public will take sides.
At a later point, we want the ability to reveal the existence and contents of said contract in its entirety, but also need the security that no one will discover its existence before we choose.
The answer is Monero.
That may be the answer, but you have to convince these megacorps to use this in the first place.