Could We See Negative Interest Rates?

We now live in the world of very low interest rates and some financial commentators think we may even enter the realms of negative bank interest rates. What will happen if a Bank Loan to a customer is also linked to an interest rate swap? The floor on the swap could typically be a zero-interest rate whilst importantly the Bank Loan could actually enter negative territory. This resulting mismatch between the Bank Loan and interest rate hedge could be a serious concern to PLC's and SME Bank customers which have entered into such arrangements. The end result could be that the Bank customer ends up paying the Bank the difference between the negative interest rate and the interest rate floor. Arguably not what the customer bargained for! This could then lead to a flurry of claims by customers against the Banks for miss-selling of the loan and  the accompanying interest rate hedging product.