I think it is far more than just an issue for middle ranked...

I think it is far more than just an issue for middle ranked lenders. It is a potential issue for all those who rely on borrowing from middle ranked lenders and the suppliers of goods which are dependent upon lending being available from them on competitive terms. Used cars would be the obvious class with higher value leisure goods and electronic devices not far behind. The Banking Royal Commission made a lot of noise about the banking industry in Australia being uncompetitive and the need for more players. A move such as this will only restrict competition, reduce the ability for middle ranked lenders to assess credit and stifle lending for a lot of middle income and low income earners in the long term. The incentive to pay bills and repay borrowings currently relies mostly on debtors wishing to retain a positive credit rating. Stifling the ability to assess credit and making the rating of it less accessible and meaningful will only reduce the incentive to pay in the long term when the population work out what has happened. It is a crazy notion IMO.