I have no proof of this, just our experience of trying to hunt down a flipping turkey in December. I think that as Poles are starting to return to Poland they are bringing a few traditions back with them.
I would say the struggle to hunt down a turkey in December is more down to most shops not stocking a huge amount of whole turkeys. I rarely see whole turkeys in most shops, and even then there isn't a huge amount of them.
I would doubt many families are doing the turkey thing on the 25th, there is such a big meal on the 24th and probably plenty of leftovers so why would you bother cooking another huge big meal, seems a bit wasteful.