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?
You cannot really expect that banks will overthrow their own monopoly if anything a coin created by a bank will be even more oppressive than the system we have now, one of the great advantages of bitcoin is that you get to be your own bank and you decide exactly what you want to do with your money but a bank which controls their own crypto will have an even bigger control over your finances, if we let the banks take over this technology they could make slaves of every single human being and we cannot allow that.