I'm certainly not counting Apple out.

Ah, the classic butt-covering sentence! A staple of the "Apple is doomed" genre. "Yes, I said Apple was doomed, but I didn't say they were doomed. Clearly, you did not understand the subtlety of my argument."

Mack's conclusion has to be read to be believed.

Happy Days continued on for five more seasons after Fonzie jumped the shark, often becoming a bizarre parody of itself centered around Winkler's stardom. Scott Baio and Robin Williams were added to the cast in the second half of the show's life to shake things up, but in the end it drifted into irrelevance and reruns.

I worry that Apple has already begun that drift, and I don't foresee any new devices on the horizon with Baio or Williams-level gravitas to ensure Apple's Happy Days continue.