You sound as though you've seen official word from Plantronics on this. Please point the rest of us to a link; I for one haven't seen even an acknowledgment of the problem being on their end, let alone that they have no intention on fixing it. As my headset is still under warranty, having that in print from an official source may be useful. I'll be damned if I'm buying another unit--or another Motorola for that matter, since that has the same problem and is also quite new.
Frankly, since it happens with multiple brands of devices--all of which work fine with other phones, even other iPhones--I expect the solution to come from the handset manufacturer, not the BT headset side. I'll be very disappointed in Apple if they don't provide some relief of this issue, and soon.