Its good to have dreams. It took a few years but PS/2 dropped from the supply chain mobo. We might move on from multi-voltage power supplies in the next decade.

I think people don't use 3.5" floppy drives any more. Or parallel ports.

So yes: the UEFI boot spec is FAT. Once, we didn't have UEFI and maybe once, in the future, boot spec won't be locked in FAT.

What was wrong with PS/2? It worked. Even with less latency than USB. And you could feel the right orientation of the plug, whereas USB was more difficult to get orientated right. And it was usually color coded.

I still think using a PS/2 mouse was an advantage in games like Quake and Counter Strike back in the day.