But what about these $150 smartphones on Virgin Mobile like LG Optimus V? I've consistently read reviews claiming battery life is one of its weak points. Surely there is a market for SOC contributing to better run time? (especially with lower power displays on the horizon)
You're assuming that the consumers and the manufacturers actually care about having a high quality product.
You spend about $80 a month for a smartphone with a data plan. Multiply that by a 24 month contract and you get around $2000. So you can get an Optimus T for a total of $2000.99 or an Optimus S for only 10% more at $2199.99. The reality is that you would have to be pretty thick to buy a free-on-contract phone, and the people that fall for the trap aren't going to care about having an ARM 11 instead of a Cortex A5. The people that do care would happily pay the extra 10% to get 100% more performance from A9 versus A5.