MorphOS 4.x for selected x64 boards and PPC64 (G5, x5000, Tabor maybe?) with real SMP, 64-bit memory map and modern Radeon drivers and FAT32/NTFS/EXT4 support would be awesome. Yes, OS3 and WOS/PUP/MOS 1-3.x apps could be boxed and Crysalid pack ported to be native. Some AROS x64 backporting only if needed fore some more Amiga x64 apps and one can have stylish and modern OS. Some "dual" application format could be used for installs, like Macs did once or mixed m68k/PPC apps were.

E-mail client indicate what kind of applications could be developed and userbase could make some OS4 developers "do the blue too" (as some did, Vampire could be m68k flavour where applicable) and some x64 developers might come with proper development tools Vamp and OS4 currently lack of.

Thats a nice wish, and alternatives are nice too exist, but I dont see where e.g.
MorphOS 4 for ARM64 would lead without tablet scaling and extensive touch screen support. And would I or you use it then? MIPS would even fare way worse.

[ Edited by vox 18.12.2018 - 20:41 ]