Are we talking about representation of the economic majority by running full nodes or economic power?
No. The economic majority wields economic power. My fault for introducing a new term, albeit meant to be a synonym.
The economic majority wields some power but not all the power in the network. Everyne must also be in consensus or else there is a chain split.
But you have again sidestepped the question:
Why do you think non-mining validator count has any bearing on a measurement of 'economic majority'?
I did not sidestep the question. I answered you before and I will give you the same answer again.
The network needs non-mining full nodes to economically enforce the rules on the miners, and the more the better to make the network more resilient. If there are no non-mining full nodes running in the network, then we only have a network with the miners making their own rules.
But tell me why you believe that the higher count of non-mining full nodes have no bearing on the network. Would it not be easier for miners to do a Sybil attack if the non-mining full node count is very low?