This data doesn’t really surprise me in that sooner or later we were bound to hit a first order saturation point. That said, as performance continues to climb and new OS revs push functionality boundaries outward, I think tablet penetration will approach smartphone penetration, and we’ll see broad replacement cycles unfold in the 3-year range.
http://www.engadget.com/2014/05/01/tablet-market-share-q1-2014/
The iPad Alone 