You can place your own self-signed public key in your namecoin record. There is no longer any need for certificate authorities which can be coerced into forging certificates.
Well, if this is properly supported by software using namecoin for DNS resolution, then - yes, this may work. The proof of the pudding, however, will arrive once it's eaten. I am not familiar with namecoin to point where the potential problems are, but do note that the failure of CAs is not in the cryptography but rather in the trust model. In modern cryptography, the problems are almost always with the practice, not with the theory.