I would take it as a "smart input device" which worked in tandem with a 10.5" or 12.9" IPP. Or in an Apple-silicone equipped "iOS Macbook". That would be a neat concept. However, I would be loathe to have it on a Macbook Pro or other "main" device.
That said, I use an external keyboard 85% of the time, and could theoretically continue to do so with this keyboard so, while not exactly welcome... I am not entirely against, if it can be made to be massively meaningful improvement.
I was hugely suspicious moving from a physical keyboard on a phone to an on-screen one.. but the use of screen just became much more important. On a laptop, this is not usually the case. They'd have to have some *incredibly* compelling input methods to make this work in a main device.
That said - the fact that they aren't "done" with input devices, and are still trying to invent new and better ways - this is a good thing in my opinion, even if I don't always like the outcomes (cough - I'm looking at you 12" MB).