We "moved away" from home--both my husband and me--and it always falls on us to travel back for the holidays.
When we were first married, my husband's mother stated she didn't mind which holiday we came home for, whether it was for Thanksgiving or Xmas. My father/family perfers for us to come home at Xmas, so for the past 15 years, we've been traveling to Iowa for Thanksgiving/Xmas on my husband's side (always on Thanksgiving). On my side of the family (in MN), Christmas get together always changes. This year, it's Dec 14-16. When my daughter was young, it was during Xmas. But now that she's older, she wants us to be home, just ourselves, for Xmas. Sometimes, we don't get together on my side until after New Years/in January.
Since we're the ones who drive (no one wants to come here), we've put our foot down and stated the weekend HAS to work for us. Otherwise, we don't/won't go home at all. This year, the extended family get together on my mom's side is sometime in January; we won't be going back for that. Paying for driving gas for both Thanksgiving and Xmas is enough to spend in back-to-back months, much less making another trip for an extended family get together.
You do what you need to do to keep your sanity while at the same time, seeing family during the holidays. I myself wouldn't want to have a "permanent" Xmas holiday set. Because of weather, school activities, etc., it's important that my family is flexible on when we get together to celebrate. So far, they have been.
I foresee in the future when the nephews and neices are grown and start moving away/not coming to the holiday celebration that we will cease going home as often (for Xmas). My husband's side has never had any issues or qualms about getting together for Thanksgiving/Xmas, so unless it's a mutual decision, I can see all of us still getting together on that side of the family.
As long as there isn't a lot of strife and headaches/heartaches over visiting, I don't mind the different weekends/times on my side. But getting the weekend nailed down--that can be very difficult. And I suspect that will keep getting more and more difficult as the nephews and neices get older and more involved in school and community activities.
Do what you need to do.