Welcome,
@Flamingeaux! I will add you to the roll call once you know for certain that you’re switching your dates. Here is what I found on disneytouristblog.com about decorations:
“There is no easy answer to that. Typically, decorations stay up and–most notably–the Cinderella Castle Dream Lights continue to be lit until the Walt Disney World Marathon concludes (January 7, 2018). After that, decorations start coming down, but it’s usually a pretty slow process and does not occur all at once. It’s not entirely predictable, either. Some years, the majority of the decorations are down by around January 10. Other years, it takes until the end of January.”
The marathon is a weekend later this year, so you may luck out! We arrive the 10th and I would love it if at least some are still up. I’ve seen them before but my hubby and kids haven’t, and they are magical! We are staying at Copper Creek and I would LOVE to see the tree in the WL lobby... fingers crossed for that to still be there.