So your argument against nerfing Warriors out of the top spot is that it would mean someone else suddenly takes over the top spot? I don't follow your logic.
We're talking about nerfing Warriors to affect balance between the three tanks. Instead of Warriors getting recruited to content because they're Warriors that are needed for content, they'd be recruited because they're tanks. Instead of Warriors relying on their job for a raid spot, they'd suddenly have to rely on their skill.
No one is talking about throwing them to the back; they're talking about bringing them back to the middle. And if you can't handle the idea of having to rely on your skill at the game to be able to be selected for groups instead of the job you picked, then perhaps you need to choke up on your tanking skills and stop getting bothered at the idea that someone on the internet thinks your overpowered job should be cut down to size.