Yeah, I know about Motorola. I worked with them for 6 years. They did not have planning post Android and hence lost out. They made a come back with Google's help and were again let down by Lenovo. I don't think one bad product will make Apple to think different and release mid-rangers as you are expecting. No way.
You think none of the iPhones have been failing post warranty since the inception of it? There must have been several cases like this. However, it's the percentage of failure that matters. And also, Apple's in-warranty support is excellent, they replace device without any hassle. I have practically seen it with my friend's iPhone 6, just with 15 days of warranty left he got a new phone and he's still using it (3 years)!! Can't imagine this happening on any smartphone brand other than Apple especially in India.