I would think it is only a temporary swap. The 6 remaining housemates get to know the " neighbours" while the other 4 housemates go gaga trying to figure out what is going on. In this case, I think it would be best to split the pairs, sending Cat, Travis, and Skye to the other house, as well as Priya. Cat would go nuts wondering what Lawson was doing with the new girls. After the scene tonight with Travis acting like a dick in the comfort room with Marina, he derives to have Aisha taken away from him until he can learn how to play nice. Skye, because she would wonder what Leo was doing with the new girls. And Priya, because she would have no game with the newbies. And of course, this would be extra pain for Travis as he would be in with 3 girls and be very uncomfortable and I think, show his true misogyny.
Just for giggles, this would be my ideal swap.