They might have trouble getting turkeys, mince pies, children's toys and Christmas trees.
Well, who says Christmas has to include all these things anyway? Christmas is just a holiday, and you can celebrate it any way you want. Will Christmas really be ruined if you can't chomp a mince pie, or guzzle some turkey?
There are plenty of tasty foods you could have instead. And plenty of alternative toys. And will the world come to an end if you have no Christmas tree?
Surely the only important thing is to be enjoying yourself, and enjoying the company of your family or friends. People who're going nuts because they can't have all the traditional trimmings are being ridiculous.
When I was young, Christmas was a much simpler affair, and not the massive consumption-frenzy it is today. I don't recall having turkey or mince pies, though I may just not remember them. We had a few token decorations like paper chains. We did have a Christmas tree. But we didn't have all the fashionable and wildly expensive children's toys that are now deemed essential or little Rebecca might throw a tantrum.
One thing we didn't have when I was a kid, but which is now a crucial part of my Christmas, is a daily tipple of white wine. If there was a severe wine shortage, then I might very well throw a serious tantrum. A cup of tea would not be a passable substitute.