Rumor has it that the WV legislature has passed a licensing law for electrical inspectors. The problem here is that they have assigned responsibility to the State Fire Marshall's office, the same folks who have pretty well botched the electricians licensing and have failed to have any discernble impact on the quality of electrical work in WV.
I'm not sure what the answer to home inspectors is, but testing & licensing probably isn't enough. The same holds true in our trade. Maybe a continuing education requirement would be helpful.
Tom