I do agree with this and I would love to remove the royal family from our money but I do like the themes the mint comes out with every so often for the coins and the bills. With the removal of the Canadian dollar we cannot have those themes anymore, which would make me sad!
I am more of a fan of a CANZUK (Canada, Australia, New Zealand, UK) currency sure we would keep the royals on our currency but I am sure there would be more freedom to make themes seeing as how it would be a smaller block. Maybe we could through Japan and South Korea in there to remove the royals and still keep the themes? Or maybe we could just agree on coin shapes and bill colours and each country could do their own themes!