Its a pity the Amiga couldn't leapfrog and jump onto some newer technology than PPC
Why? The 68000 was already old hat by the time the Amiga 1000 was released. It wasn't merely the CPU which made the A1000 special. Similarly, if you want some new Amiga computer to "leapfrog", it's going to take more than just a fast processor to do it.
Why abandon the PowePC series now? After years in the doldrums, its future now looks very bright indeed.