There is no possible success for AOS4 on X86. You might get a few extra people buy it who remeber the Amiga fondly. But then what will they run it because there will be no apps so will be emualtion within. Just use WinUAE.
The path was chosen its too late to change now. I am not saying this because I am some sort ot PPC fanboy or x86 hater. I dont care really what stuff runs on.
i just don't see any point/advantages/justification for moving cpu base.