Where are your customers in the world? Many non-US countries have little/no credit card presence, so if you don't have an international-friendly payment option like PayPal your customers may be using "gift card credit cards" purchased from a store. It's easier to do this once a year than once a month. Ultimately though, talk to your users! That's how you'll find out.
Was that statement accidental horrible wording or did you actually mean it ?
If the latter, then you must be one of those many Americans that needs to travel more. The rest of the world are not neanderthals who've never heard of credit cards.
Go to Kenya (Africa) and the only reason you might struggle to pay by credit card is if the merchant has decided to prefer payments via the M-PESA money transfer phone app instead which is what most of the locals use. So you could say a number of non-US countries are even ahead of the US !
But of course I hope your wording was accidental, in which case I apologise for the three paragraphs above. ;-)