To be honest i think we should all admit the AOS for anything other than Amiga hardware is a bit of a dead end. AOS on a PC is fine but there would be no point as there wouldn't be any software to run on it. You may be able to run the old Amiga games but at the end of the day thats what UAE is for. The only reason PPC achitecture was used is because it was sold as 68000 code could be easily ported to PPC's as the both chips were made by Motorola. Why would anyone build a x86 accelerator board for either classic amigas or Amiga Ones? The market is extremely limited, the boards would be extremely expensive and by the time a board i sdesigned and new software is written the x86 would be out of date. Then there would be the cooling issues. The board would have to be either zorro (which would be pointless as the bus speeds would be too slow and the achitecture is outdated or PCI. With PCI you would be taking up at least the next 3 slots with the heatsink and fan.
The reality is that OS4 will be the last AOS and the Amigas will then be truely relegated to Fanboys and Nostalgia freaks like us.