God, no. Anything other than a 3:2 aspect ration looks horrible on a small screen like a smart phone. 16:9 wide screen gets too rectangular as the screen size gets smaller. If the widescreen galaxy tablets look so weird and unnatural in portrait mode, you can imagine how bad it will be on a smart phone. It is silly. And who the frick cares about letter boxing in movies on smartphones? A smartphone is used for other things 99.5% of the time, a majority of which it is in portrait mode. So please stop this nonsense of 16:9 or 9:5 aspect ratio for smartphones.
I just don't want them making a huge iPhone.