You, and many others, are missing the point.
You have the hardcore who buy their shirts, season in, season out no matter who is producing it.
You then have a lot of people like myself who will only wear Adidas be it Trainers (I have Gazelles, Forest Hills and Superstars), casual retro t-shirts (I have White, Pink, Grey), Tracky Tops (I have Blue, Green - rare apparently the one I have - and a yellow NY Cosmos edition) and the usual other casual polo shirts / tshirts of which I own a few.
You underestimate the power of the Adidas brand. People like myself will spend money that currently isn't being spent at the Club Shop. Their call as to whether they want 3 figures off myself - and others - or not.
This. Totally.