Actually I bought my bitch in November, I understand where you are coming from though, so close to Christmas people are thinking of other things. It is better to be Nov than Dec and get all the puppy's bought as
presents. Do you have a waiting list? If so it does not matter what time of year? I waited for mine until Nov.
Plus side - the pups will wake up later,
Downside - If you breed indoors, toilet training may be harder if the weather is really bad, you won't be able to get the pups outside as much and of course you will have a bigger heating bill.
For the new owner, winter is always the worst time to have pups/dogs with all the mud, rain and cold bad weather so the puppy buyers will have their pups at the worst time of year, for toilet training etc too. (Rescues get the busiest after people get fed up with their Xmas pups Jan-May.)
Sorry not very optimistic am I, I will have to think of some more pluses............

If you go ahead with a later litter, be extra, extra, vigilant with the buyers and screen them very closely.