Earl, you are right, the amount of coinage used in
vending is relatively insignificant compared to other spending. There would still be a need for any equipment which accepts
coins to be able to accept the US dollar
coin. As you and others have expressed, operators of
coin related equipment are reluctant to invest in equipment for which they will fail to see a return. "Many have already installed equipment to handle dollar
coins “but we didn’t reap the savings by implementing the switch,” laments Aaron Klein, a consultant to the Dollar
Coin Alliance, an advocacy group." ("Kill Bill", The Economist, Mar 16, 2013).
If business fails to embrace the new coinage for any number of various reasons, consumers will have fewer options of where to spend their dollar
coins and will therefore also reject them in the form of diminished demand for the
coins. For example, if you are to purchase a bus pass in Las Vegas using one of the terminals on the street and it does not accept dollar
coins as it has not been upgraded to accept them, you, as a consumer, will not want to carry dollar
coins if you regularly purchase bus passes in this manner as you know you will not be able to use them. Face to face interactions are completely different and will of course depend on the merchant's willingness to accept and give dollar
coins as change. I would expect that there would be no issue with a business refusing to accept the dollar
coins as they are legal tender. Nor have I ever had a business refuse taking a dollar
coin.
As I have previously noted, with a larger denomination of
coin, people are more apt to carry only the larger change ($1, $0.25) and will continue to collect smaller coinage as they currently do. This should result in fewer
coins being carried.
Lastly, although I’m sure that transport costs aren’t factored in, even if the fuel was grossly overestimated at ½ of the total savings, that is still $6.9 Billion... not exactly chump change.