If it would be something you sign on and let it go on auto while you do other content and then get back to where you were before (as a minigame), there might be a niche for it. They would still have to adjust to players declining to join when it triggers (so maybe sent start signal only when 9/6 signed or 16/12). You can even think of signing triggering access to a special chat channel, so you can socialize before the instance while doing other ingame stuff while waiting (similar to a group chat, with difference that it should not bug quests and night instances).