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That's perfectly fine, as long as merchants see it differently we'll continue to do just fine
Merchants are not going to give 2 hoots what "coin" the customer uses, anymore than they care what credit/debit card you use today.
Another thing - and I don't think a lot of people appreciate this - forget about a "fast transaction time" making any coin attractive for use at POS systems.
No retailer is going to be doing blockchain transactions at a POS. They will use clearing houses to get transactions done instantaneously as they do today. So, whether you're paying in Bitcoin, Peercoin, Worldcoin, Litecoin or anything else, all transactions will be instantaneous. They won't be hitting the blockchain until your respective clearing house (Visa, Maestro, whatever) processes the hits on your account coming in from supermarkets.
Cryptocurrencies in general are not intended for POS use - they are *money*. POS systems deal with numbers in accounts, a very different thing.
For a glimpse of the future, look at today's exchanges like BTC-e and Cryptsy. On there you can spend BTC, LTC, whatever - all the trades occur instantaneously. It's only when you park your funds at the end of trading that you actually carry out a blockchain transaction. Thats how retail will work in the future if cryptos ever get near a POS system.
