The whole "russian roulette" I played when I pressed the power button is over. Someone else can worry about if the next time they turn the physical amiga on is the last. I think a Natami would probably be worse. You have one producer, with limited runs, on specialized hardware. Try to replace or repair that.
You have a great point here, which I'd like to expand.
In my opinion it works for all limited run hardware. Hardware becomes available. You might have a running system now, and perhaps even warranty repairs for 2 years, if you're lucky. But since the HW was only ever produced in very limited numbers (say < 5000 units), it will soon become very very hard to get repairs or spare parts. Dealers would like to help you, but are unable to since there just are no spare parts or qualified repair shops available. With new tehnologies (surface mounted components, higher bus speeds etc) it becomes harder and harder to repair things.
This is the very reason I believe X1000 project is doomed to fail even before the HW is out.
What about the alternatives? There are no magic solutions here. Either you migrate to the common tehnologies used today (read: amd64, ARM etc), or try to find some large existing hardware base to take advantage of. If the technology is clearly winding down (like it is the case with PowerPC), the 2nd option will only carry you so far. So eventually, you'll have to migrate or die off completely.
What we're doing with MorphOS currently is taking the 2nd option. We're making MorphOS available for ever wider range of Apple PowerPC hardware. These PPC Macs are available in vast quantities from various auction sites. Prices are relatively moderate (compared to new custom HW at least). You can still find spare parts and qualified repairs for these machines, and what best: if your hardware fails completely, it is relatively easy to find a replacement.
Obviously this won't last forever, but I firmly believe this is the only sensible course of action for now.