Also, isn't it a little weird that the Vidian phage was cured in a throwaway line in Think Tank?
Have any of the novels taken place in the DQ after Voyager left? That could probably make a good novel. Vidians rebuilding their society, trying to make amends with the galaxy by offering medical technology while everybody wants to kill them out of revenge. A generation of younger Vidians trying to dissociate themselves from their parents' crimes. A conflict between Vidian nationalists who justify their crimes by necessity and Vidians who want to rejoin the galaxy and start a new DQ Federation.
I think there's at least a miniseries worth of material there.