You correctly wrote that NG failed to attract many existing amigans because it changed too much and at the same time changed not enough to attract users from outside, sitting between chairs
Assuming that MorphOS becomes a super-modern OS on the same level as the big three Windows, Linux and Mac even then it lacks the software, or how it is called today, the apps. People today (expecially the younger ones) are having less and less real computer experience and are mostly using devices with special apps on it. Where do you get the Software that attracts people from outside to use MorphOS and even buy hardware for it (they will certainly only support certain models)?
Would it not be just a nice tech-demo without new special software written for it and how do you get developers to support it?
