Why would they want to stop sales? As the CFO of Apple said, when asked about the unlocked iPhone problem, "It's a nice problem to have."
“Why would they want to stop sales?”
Simply because their entire idea has been to make some profit on the hardware sale, and then much more profit on the cut of the usage revenues.
Unless they have abandoned plans to make a deal for a cut of usage revenues in China, EVERY unlocked handset is one that they have lost that portion of profit forever.
“It’s a nice problem to have.” IF your goal is sales volume at the expense of higher ongoing revenue.