I doubt it will have lots of success. First, companies can use linkedin, or other social networks such as github to reach people, second, most of the people will not want to publicly show that they are looking (their current employer could very well read that thread), and finally as mentioned in another comment, the thread will be way too long (in the "seeking freelancer" thread, there are about 5 times more people looking for work than people hiring).

Fair points. Though I'm sure the HTML template could be modified to not include the username of the person posting. Or people could use throw away accounts. Its doable.

Then you would have lots of throwaways, saying "I am looking for a job, I am good at X and Y, please contact me at [email protected]". I doubt it will have any success.

Of course this would happen. But do realize how much more valuable the whole site would be to the users and to YC. This should be tested.