Firstly this particular section is for discussing only bitcoin related topics. Bitcoin cash is an altcoin so I have just reported to moderator to move this topic to altcoin discussion.
Secondly, anyone can say anything! This is a free world and anyone is free to predict anything. But Banks will not become extinct anytime soon. They will change their business model to adopt the situation and keep on thieving the way they are doing it now. The way Rogar's prediction doesn't effect the banking system, the similar way Warren Buffet's negative prediction doesn't effect cryptos. The only deciding factor is what the global market thinks and that is not easy to predict!