Is this the beginning of the end for the iPhone Fad?

When it comes to usability, generally everyone would agree Apple has always been the king ranging all the way back to the early 80's.  The iPod turned cellphone -- iPhone seemed to de-throne the Palm Treo as the new king of the smartphone world shortly after its introduction.

But does usability carry a product long-term for Apple?  The AppleII series, Lisa, Macintosh,  Newton, PowerBook, Quadra, QuickTime, AppleDesktopBus, all products that made a lot of noise when released, some were quite successful, most now hold a minority marketshare if any.

Now I read that Samsung has now shipped more smartphones than Apple this past quarter, evidence of a profound change in mobile computing again.  Human beings now choose Samsung over Apple smartphones.  Do people really prefer functionality over form long-term?

Using Apple's product history as a guide, once they lose top marketshare has any Apple products recovered dominance?