Lachlan Murdoch and Rupert Murdoch's Fox is buying Roku. But why? Adrian Edwards/GC Images There are so many things to stream. Wouldn't it be great if you could see them all in one place? And if you owned the place everyone came to when they wanted to stream, wouldn't that be worth a lot of money? That's the logic behind the Fox/Roku deal. Except … Rupert Murdoch chased the TV Guide of the Future for years. He spent billions trying to build an on-screen map for digital television before giv...