OK, here's my prediction: very few people are going to keep their "skills profile" up to date. How do I know this? Because they keep pretty much nothing else up to date. How's your website doing? Are the friends on your friend list still your friends? So what needs to happen instead? What we will have (evebtually) will be an AI that looks at everything we've done and constructs a skills profile for us. Parts of it will be human-readible, but parts of it (the most useful parts) will be based on byzantine data-processing algorthms only an AI could come up with.