That's a little off topic, AOS4 classic is never going to have SMP ![Smiley :)](https://forum.amiga.org/Smileys/default/smiley.gif)
You are nitpicking.
And, no, there will never be new PPC accelerators for classic hardware.
Especially with more than one core.
At some point abandoning legacy hardware makes sense.
So i will agree with you that emulation should prove adequate.
Because you would hope that better native software would be developed and the old software marginalized.