If this is the 7s/7s Plus version of the phone only, and the 10th anniversary edition (whatever name it ends up getting) will be as constrained as is being speculated, it is possible we'll see record numbers of people simply holding onto their current phones until the "real deal" becomes more available.
Also, I know this is an artists rendering, but a lot of skepticism should be placed on going back to chamfered edges alá 5/5s/SE. Unless the glass on the back is true...that would be a nice melding of the 4/4s design and the 5/5s/SE design.
But that puts us back to TouchID on the back, which doesn't seem likely at all if glass back is true, unless, again, that will only be for the 10th anniversary phone...
If TouchID is on the back I can see Apple putting a lot of stress on a new and different method of unlocking the device, i.e. the retina or iris scanner that has been rumored. Then they can say, "Apple has always been devoted to your privacy, and we've gone to great lengths to protect it over the years. With this new method, your data is more secure than it ever has been before. It is the fastest, most advanced, and secure way of verifying your identity we have ever developed, it's like pure magic! Oh, and by the way, TouchID is still there on the back of the phone for an even more secure device." A bit like it will become secondary, or as a second factor of verification, like the passcode has become in the last few generations of phone.
Anyway, it's fun to speculate! Loving the hilarity with which people are so adamantly defending their own principally baseless thoughts and opinions as close to infallible and undeniable facts!