Crypto vending machines are simpler to operate and they effectively carrying out crypto operations. What do we purchase that will take longer time to transact? Cryptocurrency is here and have come to stay, witnessing whole difference when you pay in crypto and also having some sort of sense of comfort, because it's very fast and reliable. However making payment in different volatility coin, what do we expect? That's why stable coins are originated to keep every transaction stable. Buying some groceries with crypto is one of the measurable methods to noticed about the advanced path of crypto in our current days.
Stablecoins will do the trick. But vendors would need to make sure the vending machine has constant access to the Internet. Otherwise, how would transactions be verified on the Blockchain? It's one of the few limitations of such an implementation.
Considering that some countries lack Internet access, it's going to take a long time before we see mainstream adoption for crypto vending machines increase at a large scale worldwide. At least, we know crypto is the future of money. Who knows? Maybe crypto vending machines will render their Fiat counterparts obsolete. One can only imagine...