100% impossible because bitcoin is not accepted by all countries and there are many country which are against bitcoin. and bitcoin is not the safest form of money because it has limit of 21 million so this would definitely cause crisis.
That limit is what makes bitcoin valuable. Without limit, it will be just another fiat that can be printed out unlimited, slowing losing value. But even with that said, it cannot make banks disappear. It is not designed to eliminate banks but just an option.