Eh, ok... arguments are getting thinner and thinner.
Guess you are seeing some light.
My arguments are getting weaker? Considering any new PI needs to be roughly the same size, and prince, (see previous changes for proof of that) any change needed that makes it larger and more costly is a deal breaker. A hypothetical PI3 could be greatly improved with better silicon, better silicon can add features without associated cost, POE simply implies a larger board is needed, and a higher price.
So, No I don't "see the light", I see that POE cannot be added without increasing the price. A 2GHz 4GB model of a PI might be ultimately possible, and perhaps something like USB 3.0 can be added without increasing the cost, because all that can be done with a change of connectors, and better silicon. POE can not, and the fact that its a feature few people will need thus want makes it a non starter. That people will want this and pay the price for it is just wishful thinking.
I can see a POE HAT board would provide for a neat POE solution, only a very short loop though RJ45 cable, just a few cm long would be all that is needed to connect the boards together, so no separate long power cables, and ethernet loop through cables are in fact needed. the PI can be powered through the GPIO's. There would be two RJ-45 connectors on the HAT Board, one directly above the PI's magjack, the other one for ethernet + POE power somewhere else on the board, for example directly besides the first one.