Apple cant get complacent. They done that with the iphone and let Android take over.
Apple was never even the top player to be "taken over." They had no market share in the beginning. Also, where did you come up with the thing about Android "taking over." While Android is certainly a good platform, the fact that it is freely distributed to multiple manufacturers as well as the fact that the devices are available with tons of carriers have been significant factors in its rapid rise.
I don't look at those two facts as bad for Apple. It only speaks to the tremendous potential that Apple has. Let's not forget that it's Apple's one iPhone competing against dozens of Android devices. Also, in the US, the iPhone has been on more than one carrier for only seven months. Before this, AT&T was the only carrier. While Apple will never license iOS to other manufacturers, Apple has yet to open the iPhone up to other carriers like Sprint and other carriers overseas.
And it's not like Apple is hemorrhaging market share. Also, Apple makes more than 60% of the total profits of the smartphone industry.
It's not over. Android has not taken over by any means.