I was also frankly disappointed with the pairing suggestions. Port, Madeira, Auslese...jeez, guys. Here's what to drink with fruitcake: Vin du Bugey-Cerdon "La Cueille" VDQS sparkling wine from Patrick Bottex. His winery is in Ain in the Rhône-Alpes, and he uses the Altesse grape, very successfully. It's light, it's bright, it's refreshing, with just a bit of cidery sweetness.
h/t Fredric Koeppel at "Bigger Than Your Head" for the image.