Wireless charging would be a catastrophe at that scale. It is terribly inefficient; multiplied by the number of iPhones in circulation, and we would have gigantic amounts of energy wasted because Apple didn't want to bend to a non-proprietary port. We already live in a world where the energy is an issue and the EU USB-C law is precisely aimed at reducing waste, it would be a horrendous decision on a disastrous scale, especially as other phone makers would quickly follow.