The arrogance in this thread is off putting. I am a relatively experienced photographer and I am telling you that photos come in all shapes and sizes. It's a fact. Look it up. If you shoot with a "Pro DSLR" at 3:2 you have to crop pixels away to print an 8x10 or 5x7. Like I said before, there is nothing magical about 3:2.
While an argument could be made that Apple should physically change their sensors, it is not a requirement. Changing the software to allow a 16:9 option in a setting would be child's play. Why is it a preconfigured crop ratio if it's so horrible? But who wants to manually crop dozens of photos just to show them most attractively on your TV?
Apple WANTS you to view your photos on your HDTVs. They market the heck out of AirPlay. There is just no logical reason why they shouldn't add this as an option to maximize the viewing on a large TV, or an iPhone, or an iMac, or a MBP, since virtually ALL their devices are widescreen (except iPad).
Yes there are other apps and I use them. But they aren't easily accessible from the lock screen like the camera app is, so they are not as convenient. I promise this will be an iOS option one day, and they will call it "magical".