Yeah, I like this. One civs luxury is another civ's forgotten resource.
I have been toying with a scenario (incomplete right now) in which the different culture groups or flavours start the game with their own resources (bonus, luxury and strategic) and cannot see the others not from their area until after trading with other civs.
For example, Horses were brought to the Americas by the Europeans or spices were well sought after by some civs and trades as a result. Now, the Europeans never knew about spices and the First Peoples never knew about horses, but after a little interactions with other cultures, they were aware of these resources which then became demanded.
I like the ideas mentioned here. After thousands of years, Wines may not be that big a deal to that culture, sure that region still enjoying it and benefits from it happinesswise (yes, it's a word, now) , but wouldn't it make more sense to trade for what one doesn't have? I think after learning about other possible resources, civs might want others. Trading would become a bigger part of the game, as would early expansion. The problem of only 8 possible resources working would be eliminated by the oldest (or ones chosen based or based on certain factors) not counting as much or only to a certain type or worker (Scientist, Taxman, etc.)
What I was trying to work on was each flavour or culture group trading the tech that would reveal their own resources, but at an appropriate time to reflect what happened historically. I wasn't sure how to value to the tech, to prevent non-flavour groups researching it, but also not too high, that a civ could trade it for the kitchen sink.
This is something that I would like to see though.....let's hope and see