I guess when he gets sick of Hobbits and Middle Earth Peter Jackson would love to direct Doctor Who. In fact he wants to do it so bad that he would do it free. The full interview is in todays Entertainment Weekly and here is a snippet of what he said.
"They don't even have to pay me," Jackson joked, adding: "I have got my eye on one of those nice new gold-coloured Daleks. They must have a spare one!"Lets hope Steven Moffat is listening as this would be pretty cool to have the guy who brought Tolkien to life before our eyes to direct a Doctor Who adventure.