The reason SO works is because it ties a CV to their questions, answers and rep. If we are trying to make the workplace equivalent it would work because of the questions and answers given. If we make the push for Workplace Careers people will worry about having their questions tied to them, everything will end up being asked and answered anonymously. and Workplace careers becomes just another job site.
For it to work it will need to have something that sets it apart from other job sites, namely, being tied to a valid, used, workplace user. Which poses issues for those users with questions …