I personally don't think that this will happen because the Bitcoin isn't capable of doing this.
And the banks won't let the Bitcoin make them disappear, they will find a way to fight against the Bitcoin
Banks are controlled by the government and the government can do anything to eliminate they wouldn't want to exist. Bitcoin is still existing because it is not a pure threat that will replace the banking system and we know that we can do banking with bitcoin without the need of bank but what we believe is not right because in the end, we still have to convert our bitcoins to fiat to get its value.