Well, it's not like $1 bills would be illegal or anything; there could be a transition period when vending machine companies (and others) could transition. But I don't really think the vending machine industry should be allowed to have a veto on a proposal which otherwise would save the US a lot of money (it costs more than $0.01 to produce a penny, and coins are far more durable and last longer than paper money) and make a lot of sense.