you need to rely on a real time conversion system
You should always rely on a real-time price feed. Depending on the peg is suicide. Even running a shop that hypothetically accepts Tether without actually checking a live price feed would be idiotic. It would be just as idiotic to do that with SBD, even if it had a hard peg.
Shop owners who accept any crypto should have live prices to guard against people who take advantage of shocks in the market.
quote out of context.
I was not referring to live price feed conversion (this can easily be implemented into Steem or any wallet), but to services like Bitpay which convert (exchange) the paid crypto instantly into FIAT and which merchants rely on in the bitcoin world. This is clear in the part you omitted from my quote. ;) ("ala BitPay", "fees", etc)
Of course it is wise to always keep an eye on the real live SBD price, that's common sense. In any case merchants wouldn't start adopting SBD until it's peg was fully proven and battle tested. So even if the proposed changes were to be implemented tomorrow and worked in controlling the SBD price, it would be months before online shops would even consider using it.
Market swings of around 1% are probably unavoidable but they would not be that much of an issue, especially considering all the savings in fees and possibly taxes compared to the FIAT system.