There has been talk everywhere of limiting the scope of banks. It is argued that the "utility" part of banking, the provision of basic banking services, must be separated from the "casino" part, which includes investment banking and proprietary trading. The mechanism proposed in the UK is the Vickers Commission proposal for ring-fencing; in the US, the preferred mechanism is the Volcker Rule. There is growing clamour in some circles for a return to the Glass-Steagall Act which would give a straight separation of investment banking from commercial banking.
I believe the focus on scope is not the way to address systemic risk. We need better risk management that addresses a whole set of issues other than scope. Here is my EPW article, How do we resolve the too-big-to-fail problem?