I have spent a great deal of time observing Linux over the years. This is not to say that the Linux Kernel no longer exists. Instead, it is to say that the concept, the movement, the ideology, the drive, and the freedom that all represents the concept that is Linux is what has died.
What is Linux
There is a common misconception on what Linux actually is. Linux, or more specifically, the Linux Kernel is just an Operating System. It is neither a movement, nor is it a Distribution.
A Distribution on the other hand, is a complete system containing the Operating System and the User Space Software as needed and as defined by a given Distributor.
Treating a Distribution as the same as an Operating System is a common mistake due to how other Distributions tightly couple their Operating System to their Distribution. An example of tightly coupling the Operating System with the Distribution is Microsoft Windows.
This language situation has resulted in the term Linux being used to also represent the open-source ideology and movement that is guided by the open-source flag ship known as the Linux Kernel.
It is this ideology and movement, this concept and drive, that is casually referred to as Linux that has truly died.