]A 5"-7" screen would be highly unlikely but with the new regime, anything is fair game.
I wouldn't mind seeing a slightly wider screen however.
This whole "wider screen" thing has cracked me up from the beginning.
Apple moves to the more popular 16:9 aspect ratio in a 4" screen and people say "make it wider"....Apple can't (no smartphone maker would) just make it wider without doing one of the following:
1) ruining the aspect ratio
2) Increase the bezel (which is the opposite of what any smartphone maker is doing)
3) moving to a different aspect ratio (which would make the screen shorter)
4) adopting something other than the 4" size
At 16:9 and 4" diagonally, the SCREEN on the iPhone measures at 3.49in x 1.96in. This means there is approximately 0.35 inches of TOTAL bezel on the left and ride sides of the phone (0.175 in on each side).
For the screen to be wider and still retain the 16:9 aspect ratio, the screen size couldn't stay at 4".
Apple could adopt the still popular 16:10 ratio and at 4" this would give the SCREEN measurements of 3.39in x 2.12in - an increase in screen width of 0.16 inches and a reduction in screen height of 0.10 inches.
Of course - the real problem with ALL of this is developers and fragmentation. To widen the screen would cause developers to write completely new resolutions into their apps - as it is, the iPhone 5 retains the width thereby making devs only account for added height.
If you want a bigger phone, I get that. They are popular these days - personally I think the sweet spot would be on the lower end of 4.3" - 4.7" - but to assert that apple made the iPhone 5 screen too skinny doesn't really make a whole lot of sense given what's already out on the market. Apple didn't come up with some foreign device that's abnormally tall and skinny - they simply did a 4" at 16:9 - which exists in other manufacturers lines.