I agree that it's not a big issue.
I live in a country with about 100,000 people. There is no Amazon, no Apple. Nintendo, Sony, Microsoft...none of them have any presence here. Thinking about it, I can maybe think of 3 places that MAY sell LAN adapters but even then it's by no means a guarantee.
But like I said, I can still order via Amazon to a freight forwarder in the US and get it shipped here. We have to do this for a lot of stuff as it's either too expensive to buy locally or it's simply just not sold here (and even then, importing most things is extremely expensive too! Thank God for digital games!)
So I'm not sure about the other guy's situation, but it's not completely alien to me. My biggest concern right now is making sure I can secure an Amazon pre-order for the Switch or else I'm out of luck!
EDIT: I should probably point out that Amazon is a godsend as the vast majority of online retailers don't accept international cards. Thankfully Amazon does.