How in the world would he be better off forgetting the whole thing? I'll never understand that attitude. Education for the sake of education is still good, whether he decides to go through with it or not, at least he'll have some advice about the right way to do it. Saying (more or less) "you don't know so I'm not going to tell you" is just wasting your time and his.
Boardman, I'd say if you like cherry or your brother in law likes cherry, it's always worth it to try and salvage some of the wood for something other than a fireplace. Turning blanks really don't have to be all that complicated and can be simple slabs a few inches thick, which make perfectly find serving bowls among other things. Texas is right about waxing and sticking somewhere for a while to let them dry out.