Eh, I think they'll be fine. TTK release + emotes + festival of the lost has made a ton of $.
We'll probably only get the raid challenges and possibly some new micro-transaction stuff for Xmas to hold us over until next year.
I don't think they're that worried about people taking a break for the holiday games. They've said before they feel Destiny is a game you can play for awhile, stop and come back to it. That's what most of us here with tons of hours invested in our characters will likely do.
Honestly, I'm looking forward to checking out some other games. It's been over a year.