This suggests that administrative costs could be cut substantially, but they aren't the biggest cost problem in the health care industry. It's worth a read, too.
And even so, when I think about the administrative costs going towards auditing and claims adjusters, spending on policies and lobbying, spending on advertising, on executive salaries and bonuses, and their spending on lawyers - I think there must be some low hanging fruit available in administrative costs.
We want to get the health insurance industry to be competitive in the pricing and services they provide. We don't want them to fail, but we do want a competitive market. See the first link above to see how out of hand things have become, just in the last 10 years. We have to stop that trend....