I think there is a place for a 1:1 backed currency on the blockchain, but I'd rather see Governments actually print for example USD and AUD onto something like an ERC20 Ethereum token.
This would add real fiat to the blockchain which is important, as in the end all taxes are paid in fiat. (It would be nice to be able to go directly into AUD for all crypto currencies, rather than the mess I have now which is to use an intermediate crypto currency like Ethereum or Bitcoin to move in and out.)
Those extra transactional costs really screw with a lot of us.