I don't think he's going to be particularly bothered about Fiver & Five USA.  I could see both channels merged and a separate kids channel launched.
Even though both channels have had some success, Desmond's priority is going to be making the main channel more solid.  Fiver & Five USA always seemed to be extra channels just for the sake of it, because it was seen as a long term strategy.  In reality, the strategy should have been in making Five a dominant player in the multichannel market as a multichannel itself.
	
 
Kids channel? Were would that sit amongst his portfolio of porn channels - Television X, Red Hot TV and others? I'd like to list some of the print titles too, but I don't think the swear filter would cope, and its a little early on a Sunday for, "Buckets of *****"
Isn't it more likely that he's planning to use the  
DTT space he gets with the purchase of Fiver and Five USA to widen the spread of his porn empire, and that talk of poaching worthy and popular programmes for Channel Five is just that - talk?
I find it difficult to imagine him doing anything other than that which already makes him very wealthy indeed.