We don't need thinner devices, my iPhone 4 is already hard enough to hold. As the devices get smaller so do the batteries that they use. Nobody is going to complain about a device that's slightly thicker and boasts something like 50% longer battery life.
I still use a 5th green iPod video because I can get 10hr constant usage most of the time before it dies. My wifes nano is lucky if it lasts 7 hours.
I still use a 5th green iPod video because I can get 10hr constant usage most of the time before it dies. My wifes nano is lucky if it lasts 7 hours.