SIX MONTHS AFTER its November 12 debut, the PlayStation 5 is well on its way to being a success story for Sony. As of March 31, the company had sold 7.8 million of the new video game consoles worldwide—enough, in both units and dollars, to make it the biggest console launch in US history. Bigger than the Nintendo Wii. Bigger than the Xbox One. Bigger than even the PS4. And who knows what that number might be if everyone who wanted one was actually able to buy one.