Okay, though if this created a resurgence in the cash economy, I think the government would amend the legislation. A lot of companies might not want to deal with the cost/ risk of handling more cash.

Mostly I expect that the highest card surcharge will become the new price and if there is a cash price, it will just be the current price at best. It really looks like it will just mean higher prices for all consumers and less versatility - the biggest rent payment platform owned by Macquarie bank has already stated they just won't accept cards any more.