Hmmm for the architecture choice ... i don't kow but what i would do if i was in the dev team is to create a brand new OS , Opensource is not the way because Morphos rights are still to Ralph Schmidt and the devs have a better interest for working on Morphos if this can help them to buy pizzas or food or simply new hardware devices to work on.
If i was a talented developper i will do a modern Os mostly hardware independant to avoid the rewrite of drivers every days.
So i expect to use a Linux Kernel and my Os will use drivers written for linux by a sort of wrapper(a bit more complex), so we don't need to write Nvidia or Ati or Intel drivers but just a sort of wrapper for Vulcan or Opengl.
For using Ppc software we can imagine that it can be encapsuled inside a box (Abox) using the virtualisation facilities.
Virtualisation can be a chance if it's used in a sensible way.
But i'm not developper, but i know that rewritting drivers is a shame and for supporting a great amount of machines using a linux kernel can be a good option (instead of qwark)
I'm not sure that using linux apps like in aros is very intersting , i prefer native stunning apps even if they use opensource parts, if we are on X64 , javascript Jit or Uae Jit and many programs like Mupen64 or DCemu will be easier to port, think of no more endianess issues and a full opengl support...

[ Edited by acepeg 05.03.2019 - 21:45 ]