Thats your interpretation and if its true, none of the current efforts will work either.
Yes, they will most likely fail.
ACK & Troika are back to buying COTS boards which aren't marketed to the Amiga market, and thus will fail.
No. This only applies to Troika's so called "high-end" board. ACK have own designs. Troika would probably license/relabel a 3rd party design and market it to the Amiga market. This is different from PPC Macs.
So basically you theory is that the only hardware that OS4 can run on is the three Teron models that can no longer be manufactured?
No, this is not my theory, see above. If a "company" such as ACK or Troika will have either an own hw-design or a licensed 3rd party hw-design and approach Amiga Inc, then there are possibilities that this hardware becomes "OS4-licensed". Still rather unlikely, but after all more realistic than Amiga Inc. granting a license for PPC Macs.