The cameras are already good enough just make the phone a better over all value. Increase the thickness of the phone slightly to get rid of the wobbly bump and improve battery capacity. Sell it for $150 less than this years.
Lowering the price would hurt margins and Tim knows this and won't do it. The iPhone brand is strong enough to sell at higher prices with only slight impact on overall sales numbers. I think a small price increase with the addition of more features like a triple camera set-up would help boost Apple's bottom line even if sales have slowed a little. I'm not a huge Tim Cook fan because I feel he lacks vision, but I will give him credit for knowing how to get the most profit out of a very strong brand name.