Why would you? Some businesses live of high-volume low-value transactions (grocery stores, bookstores, etc.) I'm sure they care if you pay or not.
And yet they accept credit cards, debit cards, and personal checks (some even accept paypal!), all of which take more than 10 minutes to become irreversible and avoid fraud. Apparently most businesses are willing to accept a small amount of risk in the interest of increased transaction count and convenience. Fortunately bitcoin becomes irreversible far faster than the convenience payment systems that many of them are accepting currently.
This losses (reversals) are passed on to all customers in the form of higher prices.
And I certainly don't want to accept credit cards at my garage sale.
And many POS purchases are debit cards, which do not reverse typically, because they don't spend if account is below balance. I realize there are a few exceptions, but less so than for credit cards.
And the point is to replace cash, so I can swipe or press a button on my mobile phone and pay anyone any where, even they don't have a merchant account.
So as I said, it would be better to fix the problem, and I offered a technical solution, to make transactions instantaneous.