Warrior main tanks in non-scrub guilds have up to 24k HP right now with Sunwell gear.
T6 gear probably won't be replaced until 80, like McClain said. I was still wearing T3 pieces when I hit 70 and didn't start replacing stuff until I was getting D3/T4 gear. Some of the old "holes" like neck, rings and trinkets got replaced early on in the 60s, so I'm expecting the same thing to happen.
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