PowerUp cards had separate kernels for PPC and 68k and application development was cumbersome. It always is if using 2nd core/cpu requires using (too many) special tricks in coding. After all there were only few useful PPC applications for PowerUp/WarpUp.

For sure the future is on multiple cores and MorphOS must go there in the future in way or another. But Aeon Amigaone probably is not the one.