Anyway, why do you think that's a problem you need to think of?

You could probably spend a trillion dollars reinventing the kernel and still lose out to Linux in a world where the internet still exists. If you insist on a commercialized outcome then no amount will really be enough.

They're all basically the same thing.

Heck Android and iOS are basically the same thing.

Would a new commercially viable OS be able to offer anything that current ones don't? If not, it's not really commercially viable.