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There are more reasons you use warriors to tank than just crushing blows. Spell reflect is a required skill for some bosses/mobs unless you want to take very serious risks. 16% straight up magic mitigation is another reason, along with being able to break fear as an innate ability. They also get the best itemised gear for a pure-tanking situation (if druids had pure stam/agi gear with a bit of def or resillience added, it would be insane - warriors get 5-6 stats to spread their focus on which means they get more stat points for itemlevel on well itemised pieces and they get the pieces while druids generally don't for a pure-MT situation).
Block value is a perfectly viable system as it works right now - theres certainly no need to make shield block mitigate a fixed % of damage as it just makes it a second form of armour that works the same against all melee hits (and blizzard have already moved away from %based systems with the rating systems, as things were scaling too seriously for TBC).
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