I've heard people say on this site that increasing the iPhone's screen size is impossible due to software changes needed. e.g. "...it's impossible for Apple to increase the size of the iPhone 3.5" screen because of the App development community and the SDK. I remembered being mentioned that if Apple increases the screen size, all the app developers will have to rewrite their apps again to support the bigger size." But it would seem to me that, as long as they kept the screen proportions identical (3:2?), couldn't the apps simply be scaled up? There's enough resolution on the retina display to keep 300dpi and increase the screen to say 3.7 inches. Any insights?