Maybe possible with doge if supply of it get burned.
If DOGE will gain adoption then the demand will increase.
Though DOGE has a huge supply but you still see how significant the increase it has in the past year, however, we have to make sure that it was due to a real adoption, not due to hype only.
Whatever Cryptocurrency and fiat, both are difficult things. You can use both. if your Government accept bitcoin, then there are lots of stores, supermarkets which accept bitcoin and you can enjoy fully go in crypto but as government can't control it, they'll never let replace fiat with crypto but they'll allow to use it anyway, possibly apply taxing on it
TAX is automatic once crypto is being regulated.