Possibly, but not for a little while yet. Android will probably die with Google, which will still survive for at least another few decades. Besides, when its time does come, there will be better alternatives using the no doubt much, much better technology of the time, just like how Android today is much, much better than the now dead PDA OSes of yesterday. Linux will always exist, and I get the feeling there will always be an open-source, if not Linux-based, OS for phones.