I would add that I think that might be more the case for larger organizations than smaller ones.
One of my roles is as the director of the Insurance and Liability Resource Centre for non-profit organizations, which Imagine Canada runs. It's funded by the Ontario government. Through my work on that, I would say that among medium-sized organizations—not so much the small ones, because they're so small they hardly have time to worry about anything—there's a great deal of concern about liability. Anything that might even hint at increasing the chance of being sued, etc., I think could deter some people, particularly from the medium-sized ones. They feel reasonably well protected with a large organization like Red Cross, which would indemnify them and have the insurance in place, etc., but not so much with the medium ones.
So I think it's going to be a continuing challenge to attract directors.