If "winning" means "same operating system on all devices" then I don't think Electron, etc are competing in that contest. ChromeOS (which I understand to roughly consist of a Linux kernel and Chrome, and not much more) is by far the closest in concept.

Imagine, a process per browser tab for all the things! Why should this not be the case? It would be a revolutionary improvement in process visibility, in general. moreover I don't see why there would be any limitations over what you get with ps and dtrace.

Indeed, I suspect there is a quite nice visualization of the kernel itself that would fit nicely in a browser tab. Maybe not a real-time picture, but surely you could do simple simulations at the very least, and perhaps set configuration options if you wanted to change your own kernel.