I'm not sure it's that simple. For example, the people I knew who hated the removal of skeuomorphism didn't get over it when they watched WWDC, or some TV commercial. They just kept using their devices, and waited a long time before upgrading. But they then upgraded and shut up, and not because they saw a commercial.

It not that they were convinced the new look was better. It's just that no sane individual would stick to a iPhone from two generations ago just because he doesn't like his notes' background color.