Fragments? Certainly.
Dies? Linux has been fragmented from its inception. If you include the world's Android phones, Linux probably runs on more computers than any other kernel or OS. Rocket will not kill Linux, containers, or docker. In the worst case, it will kill CoreOS, and even that's unlikely.
Likely not even close. Just about every single washing machine, refrigerator, microwave, digital stove, etc, runs a variant of an open source operating system called Tron, or the more common ITron variant.
