The thing is, no one would accept gold for a pizza, if chances are, the gold lost value on your way to the bank. In case of crypto currency, what if it drops 25% and you made a loss? You will have to raise your prices 25%. See steem gift cards, they have ultra high fees as they convert to btc and from there to usd. If they accept sbd with a strong peg, they can convert once every few days with less fees, or maybe at some point need no conversion.