After perusing the forum and seeing both ends of the argument for bahamut's coil and other hard content, it just sort of occurred to me that no one really is concerned with the content itself, but whether they enjoy doing the content and are getting rewarded for the time they have to invest to get that content done. Whether someone is casual and only has limited time to play or is a hardcore player, both sides want to see rewards for their efforts, and there's definitely ways for them to achieve that without having to mess with multiple difficulties and other shinanigans.
What if the fights, instead of rewarding people only if they complete them all the way through, rewarded people by phase? When we run duty roulette, we get myth, gil, and sometimes soldiery and company seals, so why not reward those things for each attempt on a boss depending on how far the group has made it each time?
If the "rewards per phase" were awarded daily, that would at least convince people to give the fights a few runs per day without feeling like they are losing out on something. Heck, right now there isn't much reason why there can't be rewarded gil each time we fight a boss and make it past each phase.
Would this change involve having to tweak gil sinks? Probably, but it's probably a better direction to take for everyone then to try and have to develop multiple versions of the same fight like they are doing in WoW.
In Summary: End game raiding in hardmode is about the journey to victory, not necessarily the victory itself. Just reward people for it and more people will be willing to do it and put up with teaching others how to do it.