This is a hypothetical question but it's based on reality.
Let's say you're in a good raiding guild that has become accustomed to clearing heroic content at an acceptable rate. I'm not talking about World Firsts here but a few Server-firsts here and there and a wowprogress positioning of roughly 400-600.
You raid 4 nights a week and generally make solid progress. You try to balance things out with real-life while maintaining overall good performance.
You've just killed Majordomo and Baleroc heroic, which were hard, but manageable.
Now the path is open to Heroic Ragnaros.
It is generally accepted that Ragnaros is one of the, maybe even THE hardest raid-boss in WoW history. He has at this point, still only been killed by 19 guilds and the kill-rate doesn't seem to be increasing much.
Knowing that Ragnaros is such a hard fight and your guild probably doesn't have the quality nor endurance to kill the boss, would you still attempt to kill him or simply wait for a nerf?
On one hand, practicing the fight might make it easier to kill the boss once a nerf does happen, giving you an edge in the competitive race.
On the other hand if you try too hard you run the risk of burning out your raid on a practically unbeatable boss.
Assuming you were in that situation, what would you do?