This is
assuming that the larger part of the cost of textbooks is
copyright licenses. I would imagine that it is instead the production
costs of actual books, and obviously free content won't help that.
Having had (almost) direct experience of this in Africa, much of the
problem is bureaucracy and supply.
Surely free licensing will help with both bureaucracy and supply.
Anyone who takes an interest and sees an opportunity can redistribute
our work without having to get permission from anyone.
--Jimbo