It is probably a good thought but the implementation sounds too strict. The power users have ruined stackoverflow to an extent. I'd suggest relaxing the endorsement policy to a lower karma score. And perhaps a way of penalizing those who aren't doing a good job of letting positive comments in. So if you want power, it comes at a cost.

Lastly, you should also consider the intelligent but quiet guys in the classroom. Those who are uber conscious about speaking up despite having good suggestions. The fear of not being able to speak, if they don't say anything good enough will silence them.