While unemployment remains high, a degree from Khan academy (so to speak) is not likely to get anyone out of the resume pile and into a job.
Consider all of the people who go to community college and transfer in to the prestigious school for the last two years, and get the same degree. You don't need to get a degree from Khan academy, you just need to get the knowledge. Then you can transfer to a prestigious school and get the degree that gets your resume noticed.
That depends on the credit-granting policies of the institutions you attend and the field that you want to work in. I'm not saying it isn't possible, just that it is not as simple as people suggest. As long as there is an excess of supply in the labor market, hiring is going to favor the status quo.