Maybe it is interesting for embedded devices, but seems they've lost their purpose. It was never meant for business, but again, what's the point?
I don't see technological, logical, or knowledge progress in the attempt to write complete OS in assembly (anymore). I've done it myself, in high school, just for fun, a 16bit. That is also when MenuetOS came out. Now I spend my time more wisely. I've actually went on doing things that benefit the society the technology and the users.
Not that menuetOS is bad, but I suggest they reorient them selves so that there is that usable part. And I can see space for it, in embedding computing f.i. Far from having no respect for their work, which I have my hands in from day one.