There is no point in having Kazon unless Starfleet establishes a Transwarp Conduit to the Delta Quadrant. It is extremely doubtful that Kazon would follow Voyager all the way to the Delta Quadrant. Besides, the Kazon are only a threat to a single Starfleet vessel from 30 years ago not against the might of Starfleet, Klingons, or any other Alpha Quadrant power. They would just be a minor nuisance if they came to the Alpha Quadrant.
I could see the different Kazon sects joining different factions. They are not monolithic. The Kazon Hobii might join the Feds, the Nistrim joining the Cardassians, and the Relora or Ogla joining the Klingons.