I don't agree with this statement. The whole reason people get bored with content and burn out is because they have seen it a thousand times. That's why dragon soul was such a problem at the end of cataclysm; it was short and didn't take too long to complete but it was out for a year and even heavily nerfed. Everyone had done it and noone cared about it anymore because it was the same old routine for over a year.
Just because we're trying to push progression doesn't mean that we are a hardcore guild. Progression is natural--it happens as people naturally accrue gear and learn new mechanics and how to play their class better. It's inevitable. Furthermore, skipping bosses that we have had on farm for 2-3 months now is another natural part of progression especially in long tiers like SOO. Those bosses are wasted time with at least 4 or 5 pieces being DE'd or going to Off Spec each week. We can save time and speed up the process but I don't think that makes us a hardcore guild. Not to mention the fact that repeating these kills each week brings back memories of Dragon Soul for me--and it will for you too if we keep doing it for months on end.
The takeaway here is that the labels we have for ourselves are still true and we need to abide by them or we risk some significant problems going forward in addition to what we're already dealing with. There have been some excellent points gone over in this thread that I won't reiterate in favor of time but it's obvious at this point that there is a significant amount of work that needs to be put in to this idea.