I still don't understand why some governments or even big corporations would want to create such coins but they are doing it anyways so to answer your first question, yes we will see many coins like that which are created by the governments and are backed by some real assets like Petro which is backed by oil.
these are still going to be centralized coins though and there is not much of a difference between them and the fiat that the governments are already issuing except the fact that it may be a little bit more transparent about the supply and circulation of the coins.