Originally Posted by
Highrisedrifter I agree with this.
I feel that another reason is that Apple never takes a step backwards. Now it has chosen an Aluminium backing for the device, the chances are they won't go back to using glass, irrespective of what that glass is made of. Your average punter won't know the difference between the glass types and manufacturers of the previous glass-backed model and the new glass-backed model with regards to Corning vs Sapphire and so to them it will look like a step back.
You hit it on the nail right there. But there was this one curious case where Apple went back to plastic for the 5C, so I wouldn't count out anything at this point.
But I highly doubt they would abandon their now quite successful aluminum 'concoctions' so far.