I can't speak to trends, but this hasn't matched my experience personally. The generation just changes. Back in the 80s and 90s, my immediate family would go ga

I can't speak to trends, but this hasn't matched my experience personally. The generation just changes. Back in the 80s and 90s, my immediate family would go gather at my aunt's house for Christmas Eve to see my mom's family, then my grandma's house for Christmas to see my dad's family. Today, we trade off between seeing my wife's parents and siblings and their kids for one of either Christmas or Thanksgiving, at her sister's house, and then we visit my parents and siblings and their kids for the other, at my sister's house. Those sisters had to step up and become that next generation, though. There was a gap of a few years after both my mom's parents died when we no longer visited that extended family, but started to have our own as my sisters started having kids old enough to be worth visiting (in the sense that they'll actually form memories) and for us all to be in fairly stable living arrangements. Once that happened, though, as in we started having kids, stable houses to visit, and enough money to make those flights a few times a year, we picked back up just as the previous generation had. And social media and smartphones weren't really a widespread thing yet during the gap, so that clearly wasn't the cause. It was just the older generation dying off and the newer generation not having immediately stable lives and their own younger families to share.