Fully featured corporate thin-client solutions already exists anyway. Retargeting a ChromeOS laptop for that purpose would probably not be the best move. Could have been more interesting if the secure boot stuff could be changed to accept an other root authority than Google, but this is not possible by the design they chose (there are public keys in a true ROM). So despite the "secure for users" / "open for developers" speech, developers in question are still second zone citizens, the only first zone one being Google, and so by design. That's where the openness stops. It is still far better than completely locked devices, but the vision is anyway very similar to the one of apple with their istuffs and of random video game console maker, unsurprisingly.
Neither corporations nor the paranoid geeks that want to build/administrate/maintain and have total mastery of their systems including of course security and privacy are the target of ChomeOs. It's far more suitable for the general public (at least the part that don't really care about privacy and have very little needs beyond web-surfing, and will happily stays in the limited roles the big corporations are willing to put them it, with clear borders).