Clearly you're right. A man can set foot on the moon today. It just isn't any priority at all to the countries that could do it now. Sure it would be benefitial to go - but the people that decide what projects get funded aren't interested. I'm not sure how a manned Orion launch today would compare to an Apollo moon mission financially, I'm sure it's similar even considering inflation.
Anyways, how much of that are failures of space agencies or the governments that fund them I couldn't tell ya.