I'm not sure what you mean by the first paragraph. CEV is a plan for friendliness content.

More of a partial plan. I would call it a plan once an approximate mechanism for aggregation is specified. Without the aggregation method the outcome is basically undefined.

or because extrapolated values do not converge cleanly and the value that leads to the supposed failure scenario will not survive a required 'voting' process (or whatever) in the extrapolation process.

The 'people are assholes' failure mode. :)