All fine and good - but what if they are no longer available second hand?
After all they aren't in production any longer...
What will MOS run on if this source is dryed out one day?
Are there any plans?
I would be more worried if only option would be run on custom made new hardware, which are made in very small batches. Then you couldn't be sure at all how long they are available as new. You have to rush to buy one while they can be bought. And when the production stops, there wouldn't be that big used market either. It's a much bigger dead end in my opinion.
For example, Pegasos2 was the biggest success story in the Amiga world within the last 10 years. It would be a real surprise to see some other amigaish system to sell more in the future. Now that it isn't in production any more, which is the easier to get, it or G4 Mac from the same era?
Also there's still newer Mac models (G5) to expand the support. There won't be lack of the hw for very long time. We probably can go like 10 years easily. Macs are also kept very well and they seem to be valuable for their owners. Not even slower G4 models go into trash like standard PC hardware. Mac users appreciate their HW like Amigans do and treat it like that.
And while we are happily using Mac HW for years still, nothing stops developers to look other viable options. If there will be some PPC platform made in big enough quantities from reliable sources, why not. Or moving to some other architecture, why not. But nothing forces to it in near future.
One thing is pretty certain. There isn't much sense to waste time to expand to small custom made systems, which can only be uncertain by their reliability and availability. Look what happened with the original Pegasos1 and AmigaOnes for example. Small players in the industry, small production amounts, short lifetime, lots of bugs and issues to solve and patch. Steady hardware from big manufacturer with big resources like Apple would look much better, wouldn't it? Afterall, Amiga hasn't been about the HW since the old times and can't be in today's world.