I understand where they are coming from, but growing up, I don't know if I was ever rear-facing, and certainly wasn't in a booster past age 4 or 5. I'm not saying that our children shouldn't be protected (my son is 4 and still in a 5 point harness convertible car seat), but I think sometimes we forget that for years now kids have been forward facing at 1 year old, and most of them have turned out just fine. We were in a pretty bad wreck when my son was a little over two. He was forward facing and had a very mild case of whip lash (mine was actually much worse than his). It helped me realize that your collision would have to be life threatening to really cause any horrible damage, and if it was that bad, it probably doesn't matter which way the child is facing.
It might help some to keep them rear facing longer, but honestly, when is enough enough? (I see moms with 4 year olds still rear facing...seriously? Are you also going to be the mom that keeps them in the back seat until they get their driver's permit?)
P.S. I saw that your hubby is in emergency response...ask him what he sees out in the field and if it is worth it. Obviously, he hasn't seen it all, but I'm sure he has heard stories...