No it's definitely an Amiga OS replacement, and now, because of what you say, it can be rightfully be called Amiga OS, and the version number 5.0 accurately reflects the much better performance/features differences compared to previous versions. Finally you rendered OS4 completely redundant! 
Both MorphOS and AmigaOS4 are completely redundant.
If you really want to kill MorphOS then please give it the curse of the Amiga name.
