Here's the problem though. If Apple did institute a zero dead pixel policy, the costs would skyrocket. Your $2000+ computer would become a $3000-4000+ computer.
There's always going to be a tradeoff there.
This idea that because the computer is $2000 then that means no dead pixels should be allowed doesn't really work; do you think that if you go buy a $3000 Sony Vaio SZ premium and discover a dead pixel that they'll replace it just because you spent $3000 on it? More likely than not, the answer is no. At best you might get them to accept a return without a restocking fee, if bought through them directly.
I hear this argument time and time again but I simply don't understand the logic. Samsung offers a zero dead pixel policy on their LCD displays yet the pricing on those is very fair. In addition, we have received Dell laptops here at work with a dead pixel and Dell is more than happy to let us exchange no questions asked. If they can do it then I would think Apple could as well.