Actually no. People just realised they can do everything on their iPhone 6 and 6+ that they did on their iPad Mini. So now they do not need an iPhone and an iPad, they can just buy an iPad 6 or 6 plus and have all of their needs in one device.
I know many people who bought a 6 or 6 plus and sold/gave away their iPad Mini because the 6 or 6 plus does everything the Mini can.
That's my situation, I have an rMini, great product. Awesome display, but its much easier to use the IP6+ that is always by my side. It wasn't an overt action to stop using the iPad, but rather iPhone naturally just got more use.