But, if a job is posted here, it wouldn't be part of the 80% that is hidden anymore.
Anyway, if enough people feel that their peers are responsible enough to apply for, and the posting of jobs, then I do not see why it could not work.
The problem I do see occuring, though, may be why it may not happen:
TFP cannot be held responsible for any damages made by your posting or PMing of private information to un-verified persons who post jobs. We have no way of ensuring you that the jobs are real, or the person is trustworthy.