It's the same situation as with the iPhone. People said "noooo, the iPhone will be king ever!!". Nope.
Honestly, how could this even happen? With one tablet? Or 2? Where is the diversity? Where is the low-cost option? Where is my tablet with keyboard attached? Etc. etc.
Android is about choice, it will win this, undoubtly. As long as Apple doesn't produce much more different hardware and delivers at much more price points, they will not win the whole market. But well. There is always the high margin top niche ;)