Ab initio, let's put all our cards on the table and be straight with each other; Bitcoin is far from replacing the banking sector and the best is that the cryptocurrency tech will only for the now run side by side with the banking cartel. There's just too much money in the banking industry to be pushed aside over night. with the dip and bearish run of the bitcoin, that's not going to happen any where soon.
That's why the transition should be gradual and that's actually the roadmap. Gradual scalability and optimization of the entire Bitcoin network in a decade or two. For me that is the best outcome. The other extreme end of the spectrum is Hyperbitcoinization which is Bitcoin adoption going too fast bringing the world to chaos.