I read Wheat Belly as well. I wasn't aware of the whole modern hybrid wheat thing, so for this nugget of information alone, it was worth reading. I got my copy from the library.
I have a celiac daughter AND a daughter who has been all-grain-free for 6 years now, so he was really preaching to the choir in a way (in my case), but I had never thought to extend the ditch-the-grains thing to myself. The book was worth reading for this aspect as well.
Like another poster related, I too found Primal soon after Wheat Belly. For folks who cannot see through the SAD (and how long ago was it that many of us were Something Else as far as diet went?) the popularity of the book breaks the ice in a major way re grains / wheat. I'll take that, too.
In many cases, I would recommend it further. Now, if you are already living Primal well, heavy into Paleo studies, etc., I would not - it would be like giving a middle-school text to a college student. But at this point in time, how many are we (Primal or Primal-and-heavy-into-studies)? Certainly not the majority as far as all WOE's are concerned. Any resource that points to a better direction can be useful.