Agreed, rather sad to see that Dwemer (white Dwemer... grrr) has 20-ish structural furniture while Vampire furniture only got 1 writ voucher cauldron. It's a nice cauldron really, but... it's jut this one thing. Could've added more vampiric stuff.
Even the Vampire furnishing bundle from the Crown Store was incredibly repetitive. So I didn't even bother buying that. Most of them were reskins of the same cylinder with barely visible difference in content, and others looked very similar to the Undaunted tank you can buy for completing Stone Garden. So... yeah, Vampire furniture were a bit of a letdown post-Graymoor launch.
Sadly, I think seecodenotgames is right and that there won't be any more Vampiric stuff added.