Krugman also highlights another problem. The financial crisis has resulted in real job cuts. Consequently, there will be less specialized classes, AP classes etc., especially in rural and urban areas. Christensen's point is that this is a great place to introduce an education based disruption. That is what we are doing at www.nixty.com. As a country, we have limited "teacher bandwidth" (David Wiley, 2009). Whether we like it or not, this bandwidth is going to continue to decrease. We need to find ways to harness the Web, informal learning, opencourseware etc. to create real learning opportunities for people of all ages and across different backgrounds. Many of these disruptive processes are already underway in the homeschooling and unschooling domains. It'll be interesting to see how they play out and impact the traditional K-12 and higher education systems in the coming years.
We are looking for people interested in helping us solve these problems. If you would like to join us, then shoot me an email at glen at nixty.com