Android will lose its attraction at some point (as pointed out by Dave999).

However, prior to Apple/Android, it was Nokia.
And they pretty much had a monopoly in that segment.
Starting from the Nokia 5110 (1998), and ending with the Nokia N8 (2010) which lost out to the iPhone 3GS, Moto Droid, and Nexus One.

So it was a long 10-12 year reign.
So if we say the Apple/Android era started from 2009 to 2012.
Then we could say their era will end as soon as 2019, and as late as 2025 (I'm betting on the former).

So what do you think it will take to knock Apple/Android off their domination?
What kind of innovations could we expect?
Leave your comments down below!
; )