Much of this has already been discussed here before. 

The first link illustrates one of the points about people not learning from the past and how older generations life experiences and influence wanes as they grow older and pass away. Once this happens their knowledge and wisdom becomes lost on younger generations who must relearn the harsh lessons first hand.

http://debtcrash.report/entry/the-reason-economists-can-feel-safe-discussing-bans-on-cash

The second link addresses the ban on cash and how negative interest rates could exacerbate some of these bubbles and make them much much worse.  Just as lower rates have allowed (many not all) people to think they can buy  a more expensive home that they truly are unable to afford a negative rate would accelerate this notion even more. 

http://debtcrash.report/entry/ban-on-cash-negative-rates-and-super-bubbles-1