Given how well that Daemons cross the two systems, I think it may be possible and rather cool if both Lizardmen and Skaven did the same.
In Lizardmen there is the potential to have an army that out psyker the best psykers in the game, and they have freaking big dinosuars
Skaven have some really cool guns and stuff and are a potential hoard army of madness
What do you people (you are people right) think?