I thought the whole point of CEV was to extrapolate forwards in time towards the ultimate reflectively-consistent set of values to formulate one single coherent utility function (with multiple parameters and variables, of course) that represents the optimal equilibrium of all that humans would want if they were exactly as they would want to be and would want exactly that which they would wish to want.

he CEV of a culture changes (a little bit) every day. CEV is a constant. This is because humans (and groups of humans) aren't stable, consistent optimisers. From what I understand the CEV of a culture is relatively stable, certainly more stable than the culture itself. Nevertheless it is not a fixed. We, all things considered and collectively want (very nearly tautologically) for our CEV to be stable because that (approximately) maximises our current CEV. We just aren't that consistent.

This reminds me more of CAV (Coherent Aggregated Volition) than CEV. CEV is, IIRC, intended as a bootstrap towards "Whatever humans would collectively find the best possible optimization after infinite re-evaluations", if any such meta-ethics exists.