People seriously think Apple is going to redesign the 's' version of the iPhone. They've never done it before, don't expect them to do it now. And obviously with selling as many phones as they can make most people don't really give a crap about the tiny camera bulge or antenna bands.
Apple redesigned the antenna breaks with the iPhone 4S #antennagate. I don't see why they can't redesign those lines on the back case with the 6. They redesigned the flash of the 5 with dual flash on the 5S. Obviously, the form factor of the 6S will still be the same. Technology is getting better and Apple is going slimmer so I'm pretty sure they got something under their sleeves for the protruding lens. Apple is known for their design and it looks like they did a good (not best) job with the 6. I mean, if you're gonna do something, do it right. That's just my opinion.