I see a similar amount of cars with LED headlights out (almost every morning!) as for conventional headlights. Electronics fail too.The light from an oem HID system far surpasses the old incandescent. And, there are many people that will pay a premium for HIDs.
LEDs are fast replacing both, but time will tell their durability and replacement costs (most are only full unit replacement if any part fails).
Ford did mess up when they made the Escape bulbs and ballasts so difficult to replace (the Kuga, its twin, has easily replaceable HID bulbs and ballasts).