I'm not one for staying in the past when it comes to technology - things should always be changing and getting better. But... the thinning of phones needs to stop. They used to be bricks in the 80s and 90s, and now I can slip it into a tight pair of jeans. Companies, stop. Just stop. You won. You beat it. Congratulations. Now stop making it thinner.
Any thinner, and I'll need one of those sticky thumbs that secretaries use just to get it off the table. I already struggle sometimes getting my 6s off a flat surface when it's out of its case.
They need retain current thickness and concentrate on improving battery life. Design changes are welcome, just don't make stupid changes like making 3.5mm obsolete just for the sake of making it thinner.