Even if the Amiga came out for X86, Arm, PPC, and whatever CPU there is it would not take off as there is such a taint to the Amiga brand.
The only way I can think of the brand taking off is if the Amiga os is used for somekind of as of yet new technology or break into some market segment that is unexplored and becomes the market leader/ standard in that category.
If you examine NewTek. They took the toaster technology and applied it to live video streaming over the net when the big networks weren't thinking about online video. Today NewTek Tricaster is the standard Live Video Switch and Stream tool.
A lot of what is going on has it's roots back to the Amiga days.
A what if scenario here: What if Amiga had caught on as a Cell Phone OS early on? But a complete lack of ability by the IP holders held them back. At least Hyperion actually code and produce product.