Use of contract hashes and Namecoin doesn't really solve the main issue, issue of identity and trustworthiness check, so I don't think it's worth the effort atm.
But it was mentioned more than once, so there is something in it, I guess. Still, PGP integration could be orders of magnitude more useful.
The goal I had in mind for contract hashes and Namecoin integration aims quite a bit lower than "issue of identity and trustworthiness check." The contract hash provides a mechanism to immutably define intent at asset issuance. Namecoin integration is simply data storage that is publicly and universally accessible. These two items together allow an individual to definitively determine what an asset represents.
You're right, that they don't inherently provide a means of proving identity or checking trustworthiness. However, they can provide a means by which an issuer can enable an investor to practice due diligence.
For Coinprism, this can also enable revision control - especially given the ability to reissue an asset.