Earnie Shavers
Rock n' Roll Doggie VIP PASS
Singles have long been just promotion/advertising. The money made off them, even at their physical peak in the early 90s, is pretty minimal (comparatively.) And I am actually amazed that physical singles have held out for so long. But, as someone said above, if U2 (or anyone else) really want to still release a physical 'single' for anything, they could. And U2 think there's any money in it, they'll do it.