Par4QC I'd probably say not a whole lot, if you are hitting the ball around center face mostly.
The new toys are a lot more forgiving when hit off center, really no lost yardage, and I really don't know where the OEMs think they can go from there.
I agree with you on them being more forgiving. I also think drivers are lower spinning so if you have stupid high spin then maybe a new driver will bring it down some and it'll help. If your spin is good now, a new driver could hurt you with too little spin. If you're club head speed is low, you could be in trouble because you need spin.
Like you said, a center hit isn't going to change. What they can do is work on the whole face being a sweetspot. I wonder why " Twist Face" never caught on. It would seem if you made the whole face react the same as dead center but worked on the bulge and roll to bring center and toe hits back to the middle you'd have a great club right? It's just weird that nobody jumped on that bandwagon... Its barely mentioned by Taylormade anymore.