The problem is most of the bezel is on the top and the bottom. If you look on the sides, there is not that much room to evenly scale the screen up without increasing the width of the phone. No way Apple will change the aspect ratio and go widescreen. So if they really do decide to go that large, you are looking at a phone that is larger overall. I also think any phone over 4 inches is too big. The disadvantages at that point start to outweigh the advantages. You loose the ability to operate the phone screen with one hand and it looses too much portability. These are phones, not mini-tablets. I would be absolutely shocked if Apple goes bigger then 4 inches and honestly, the odds are that they won't go any larger then 3.85 to keep the PPI in line with the standards they set.