After we have learned to walk (we have modernized OS+SW on PPC) we most likely will have appealing HW to upgrade to...
(most likely PPS970 wil require a new DDR/QDR motherboard to perform well)
Right. Plus, the PPC 970 is a 64-bit chip, so even though the 32-bit code should work on it, AmigaOS would have to be redone (or updated) for 64-bit to fully utilise the features of the 970.