>>108658500Because John is the safe, lazy choice. He doesn't have the baggage that Hal has, he won't potentially offend anyone like Guy, he's black so they can play the race-pander card right off the bat, and a lot of potential viewers might even remember him from the cartoon.
Geoff Johns is said to be writing, it's tentatively billed 'Green Lantern Corps', and it's going to have Hal as the older vet showing rookie John (who will be the new face of the franchise) the ropes.
After what's been announced so far, I'm not looking forward to it.