You are so right. ALL empires and dynasties fall. Well, except for Coca-cola.
It's all in the words: I never said Microsoft's WM OS will never become obsolete. I just said it is not inevitable. In your way of thinking, then, there is no debate, since the OS X will also fall to the lion.
From Dictionary.com:
Doomed
1. Inevitable destruction or ruin.
2. Fate, especially a tragic or ruinous one.
3. To destine to an unhappy end.
If Apple licensed their OS to all of the cell phone makers, they would most likely have the complete market.
This is just for fun. No more animal quotes.

J/K