OK, one example scenario: A-EON buys 10,000 units of off the shelf x86 motherboards without CPU at about $1m cost, which will likely be discontinued stock in 3-6 months in the PC world.
$100 per motherboard at qty. 10,000??? What are you buying? There are solid board from reputable vendors for less than $60 in qty. 1 that run circles around the X1000 board technology-wise. I'm sure you could get them for $50 or less at qty. 10,000.
Then Hyperion takes at least 18 months to port the OS to it.
They might want to get started on a base x86 port ahead of time to avoid stock sitting for 18 months. Your scenario exists in the custom PPC world, not in the x86 world.
What will happen? Will customers want an x86 board in 2 years time branded as an "Amiga" that has long since expired its shelf life in PC world terms? Or will they accept that it? Will be be able to sell 10,000 units? These are the business risks that would have to be taken.
Well, some users are apparently willing to pay $3000+ for technology 6+ years old - so why not! But again, that scenario doesn't exist.
Buy 5 boards today, start the base x86 port. Once the base port is done the only problem is drivers for video, audio, etc... the same problems that existing with PPC hardware! The only difference now is you no longer need to source custom hardware any longer. You buy an off-the-shelf x86 board, develop drivers, and that's your new AmigaOne model for 2 years. Rinse and repeat.
In addition to the hardware, every third party software that has been written for PowerPC AmigaOS needs to be recompiled for the new x86 ISA under AmigaOS.
Most Amiga users don't care about existing PPC software. Bring classic software over with integrated emulation and let developers port what they want from PPC.