Is any new operating system is able to emerge nowadays ?

each week there are (in C, in Rust, in JS...)

What are their hardware support ?

at best they can run in a virtual machine

End of debate.

First: Hurd isn't a new operating system. It's a decades old project from last millennium.

And then: Doing research in operating systems serves a lot of purposes. For some it's just fun. For some it's experimenting which may lead to ideas which may be incorporated into other OSs later, where eit is a lot simpler to do in a small kernel. For some it is an attempt to take over the world, few of those will, but maybe one might. At least for a small part of the world.

Hurd predates Linux by about a year, but was under stop/start development for several years before that too. https://en.wikipedia.org/wiki/GNU_Hurd It's as old as dirt, in computing terms. It was intended to be the final part of a fully GNU based operating system, everything else having been created by that stage.

Stallman et. al. have promised since the late 80s that this would be the future, and at various stages promised that it will be ready for production work within the next year (or two). Like any promises made by Elon Musk, everyone in the tech industry has long since learned to ignore them. Maybe some day it'll be done, but I'm highly skeptical it has any chance of building up the momentum it needs.

This is not correct. Look at what is happening in the Amiga retrocomputing area. Some of them have Linux support along with AmigaOS/Morphos and Aros. Pretty succesful (expensive though) because they do not release 1000 different systems each year but 2-3.

Also, you do not have to support every system.

For example if they support these cheap n150 mini pcs, I am more than fine. Something common.

Macos runs fine because it works in a specific space.