I'm saying

"Pay attention to trends. What you state as impossible is happening incrementally despite the protests of theory."

cf. xeno's paradox; theories limited by excessive parameters will fail.

Also: maybe the universality doesn't need to be as totalizing as you assume for a global ethics platform to succeed. We aren't talking about total consensus; as hominids we are wired to have some kind of minority opposition to keep evolving. In practical terms a consensus can be 'good enough'--how you decide where to draw the lines is an interesting but necessarily drawn out discussion.