I personally think that networking will be almost exclusively based Linux in some form. If you want to interpret it as "eBPF - The Future of Linux Networking" then that is totally fine as well. That said, eBPF-based networking can be offloaded to SmartNICs already so it may be less Linux specific than you seem to assume right now.

Comparing dTrace and eBPF is definitely a very interesting question. I've actually asked Brendan Gregg in the Q&A of his keynote at eBPF summit this year how he compares dTrace and eBPF these days. Here is his answer (jumps right to the specific question): https://youtu.be/jw8tEPP6jwQ?t=4618

I doubt that eBPF will remain a Linux-only technology. Ports to FreeBSD are already underway it seems [0] and Microsoft declared intent to invest into eBPF [1]. I'm not sure what that means on timeline for eBPF availability on Windows though. There are also several user space implementations for eBPF which could become interesting to provide a universal programmability approach across traditional kernels like Linux, microkernels like Snap and application kernels like gVisor.

[0] https://papers.freebsd.org/2018/bsdcan/hayakawa-ebpf_impleme... [1] https://twitter.com/markrussinovich/status/12830391539203686...