Hardcore won’t fail but hardcore will bleed players. You level to 60, do MC, do BWL, do AQ. Somehow 40 geared players with no deaths.
You go into naxx, tank gets gibbed by patchwerk, someone crosses thadius charge. Boom 40 naxx geared players gone. Do you really think people are gonna level a new char, do all those catch up raids again to try and do naxx again? It just isn’t gonna happen. People who have raided for a year and escaped death will just quit when then death finally comes.
Or worse say I’m done with raiding and want to go out with a bang, purposely wipe a raid of 40 people before I quit. It just has a lot of problems end game.