Its a bit complicated in the math, but it would take a pretty good amount of weight. Also the weights only really help people out if they have high swing speeds. The gear effect with the driver is more pronounced at higher clubhead speeds.
If you have a neutral set up on a driver, adding 15 grams to the outside to promote a draw,
115mph Club head speed = 17.5 yards of draw
85mph club head speed = 6.5 yards of draw
Its easier to think of it like this, if i hit a 30 yard draw, i am only now going to hit a 24.5 yard draw. So lets not get all excited about this. For a good player, who might want a bit more right to left, who has a good swing speed, yeah you could benefit from this driver. For the average golfer, who has a slice, i would work on the swing path. Also, what if you change drivers in the future, you gotten your swing to to were, hey i am only 6.5 yards right, i hit this thing straight now. But you change drivers, don't get the same weighting, your going to hit it 6.5 yards right. I rather see people work on there swing, then try to get technology to fix it for them.