Well the Mickey Milers are doing a special marathon weekend dessert party in early January so I don't think it's gone for good. I have heard it might change a bit tho.
I have no doubt the Illuminations dessert party will continue. Inexpensive desserts, cheap champagne, and those willing to pay lots of $$$$ for this all adds up to a big money maker for Disney... Can't see them not doing it next year.
(I will say though this is a better offering than the Wishes Dessert Party)