I think the proposed change will not really affect the "normal" square grooves, or at least the type see in your normal set of irons. The change will however, affect greatly the deep grooves in wedges. The Cleveland "Zip" grooves and the Callaway "Mack Daddy" grooves will be a thing of the past. But from what I have heard, the standard grooves, like the Ping Eye2, etc, will be fine. "Square" grooves are ok, "Box" grooves are not.