Martha does put out a dedicated halloween edition every other year...this would be an off year. In the off years, she usually has a good bit of halloween in the October issue of Living -- which is usually new stuff, which we see recycled in the halloween specials!
I wouldn't worry too much about Ms. Stewart's empire tumbling...she's been here before, and bounced back. Bigger threat would be that, at 65 is it now?, she simply decides to retire, and enjoy her millions.