Banks use tools as a store of value by holding some assets in reserves, for various economic benefits. Although, adopting Bitcoin in such capacity, would have it's pros and cons. Obviously like controlling inflationary trends, and even help stabilize the volatility of Bitcoin to its users, and conversely such volatility could also alter the stability of a banks statement of financial position. All these could add up to a more stable global economy. Surely banks have started to think of such prospect
I think this is much more than a matter of maintaining de stability account... banks are creating new paradigms on trust model to supporting this global financial system
Why? Well, look... until recently what banks doing hold? Gold, foreign currencies and government bonds, right? These are liquid assets that the entire world readily accept, so the fact that they hold Bitcoin too means they are trust it, they recognize the validity of the decentralized network and power of it provide.
The problem is what governments think about this... these are assets they cannot control, unlike fiat currency, bonds, interest rates, and others similar. But this is very good for small countries whit poor economy that can reduce their dependence on major powers and have reserves that arent subject to sanctions and manipulation.
Anyway... the direction is for Bitcoin to become increasingly accepted, because it already has credibility... the problem are that some governments have creating regulations to try to block its adoption.