Of course, one can think of incentives for banks to preserve their franchise, thus partly counteracting their temptation to drive the last unit of their own currency to zero and reap the entire exchange value that private traders assign to that unit. For example, the bank could commit to buy back its notes whenever their value relative to a certain basket of goods declines.
These shareholders are ultimately private households, even if a chain of ownership relations may conceal this fact. The same holds true for risks assumed by the government or its institutions. The taxpayer, ie again private households, is the true holder of governments’ financial risk. Thus, talking of a “risk transfer to the household sector” is slightly incorrect.