Apple did spark new markets but now Android/Linux on dozens of products is poised to overtake the iPad in units shipped.
Android/Linux shipped on 1/3 as many tablets shipped as iPads in Q2 of 2011 but it is expected that Android/Linux will ship on 1/2 as many devices as iPad in Q3. At this rate, the iPad will be overtaken in the Christmas rush or at the latest, in Q1 of 2012.
This estimate does not consider non-branded or “white box” tablets of which millions will be shipped with Android/Linux.
see Digitimes – Upstream tablet PC component suppliers gearing up production
This is what has been promised since this time last year. The delays with Android releases and shortages of components are getting out of the way of the deluge. Apple will sink or swim. They will likely release iPad-next soon but the diversity of the Android ecosystem probably has that covered already.