Amiga is the experience and the genius that created that experience for each of us. I doubt that any of us will experience anything similar again from a computer or an OS, because nothing will compare to our first encounters with the Amiga and nothing will come along that is such a quantum leap above what we already have like the Amiga was compared to the PC and even the Apple at the time it came out.
I think that computer hardware has far outpaced the software development at this point in time. We need better software that makes our lives easier and more enjoyable, not faster hardware to run what has already been written a little quicker. I would be perfectly happy with an Amiga OS 5 written to a ROM which could be installed in an existing Power Mac Dual 2.7 G5 that had a program available that could control my house appliances, lights, security and other electronics with voice recognition and of course do all the other expected computer tasks.
What I wish would return is all the creative people and energy that was inspired by the Amiga during the first 10 years.