A difficulty for hiring managers will be that they will nave to think hard about what the job entails and then match requirements to a candidate. For instance, what if there are no objective standards? Hiring managers will have to spend more time thinking and comparing to fill positions than they do now. They will have to see the benefits of making such efforts, which are considerable, in order work that hard on something that used to be much simpler. I think that there will need to be a paradigm shift, which will probably come from great need (significant shortages of qualified people across an organization) and through people willing to help educate an organization. Those people will doubtless need active and visible support from the highest levels of management.

The support mentioned above will probably not come easily — someone will have to stick their neck out. It may be one reason why this has not already happened.

For instance, regarding Project Managers, one way to fairly compare them would be to use some common standard, such as PMI (Project Management Institute) certification. It should be faily easy to come up with other standards just as useful.

Another thought: there is often an advantage to having someone with a dual background in a slot. An example is an engineer with an MBA or PhD.