GameSalad may as well do so as Apple will have no use for apps using 480x320 resolution on the App store. Those older iPhones are known as legacy products. Eventually all support will drop as they are no longer the standard (internals as well as the display). The 3GS is at the edge as the last non HR display.
No need to keep something that is no longer a standard.
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No need to keep something that is no longer a standard.