If Amiga moved to X86 right now, it'd have a LOT of catching up to do.
That's something of an understatement, any of the Amiga/like OSs needs what is essentially a complete rewrite, MorphOS at least has the Quark kernel but no Q-Box API to speak of. BeOS had a modern kernel and API 10 years ago.
Is there room for two similarly modern OSs on Intel hardware?
No, one will have to use AMD hardware :-D
