If Bitcoins were introduced in banks, there'd be probably a different protocol made by banks if I'm correct? What would it be like?
Banks will be forced to provide services in cryptocurrency, including Bitcoin, but they will not use Bitcoin in their own activities. For this, banks have a ripple coin, more suitable for this purpose, and they have no reason to switch to using Bitcoin, which is not intended for this.
Maybe, if the demand will continue to increase because they will not refuse to this opportunity.
The money that will come in is big because but that time, we will become a trillion market and with their influence, it will only make more people trust crypto and of course not only they will transact, they will also try to invest since it gives potential to be profitable when demand increases.