It's something I should have seen coming; a trend already exemplified in most other genres, the decline of the album era.
Some music industry folk see this as a way to "combat the average person's short attention span," but I don't think that's entirely fair. This implies that every album was always a 'complete work,' worthy of listening in totality. But I think we can all attest to having CDs where the track play was anything but equal. The mix-tape, itself, is a perfect dispute of this notion.
There are, of course, albums that really need deserve your full attention: The Dark Side of Moon - Pink Floyd or Everyday is Christmas - Sia (lmao, sorry). But I think this trend is ultimately a good thing. It encourages artists to consider whether they want to put the work into releasing a full album, or focus more intensely on a few great singles.
So no, this isn't the War on Christmas. The decline was inevitable, but there's still plenty of great Christmas singles to explore.
One last note, what happened in 2008? SEVENTY CHRISTMAS ALBUMS? Can we go back to 2008?
No, really. Please.