"Rice paper"!

First time to hear about such a thing.
Yes, apparently you can make paper out of almost any plant - I've seen 'art papers' made from all kinds of grasses plus wheat, rice, barley and other grains. It means that 'Paper' as a distinct resource is a bad idea, because once you have the 'Papermaking' Technology, you can make it out of almost anything...
But, you do have a point too, and that´s a point I´d like to see on all strategic resources : They should be usable after "their time" in some way.
Like iron, made into steel later on (there`s an industrial steel mod).
I've posted elsewhere that I think the division of resources into Strategic, Luxury and so on is Artificial and Restricting. I'd rather have a lot more variety in the use, with the usage changing with Technology.
For instance, Copper is one of the earliest workable Metals, so provides an early luxury. It is also required for Bronze, so is required for Bronze Age units. Much later, massive amounts of Copper are required for electrical wiring in the late Industrial Era to provide electric lights, telegraph, telephones, electrical mass transit (light rail, trolley, subway). So that one 'resource' has Luxury, Strategic, and Production/Happiness consequences.
Iron, the quintessential Military resource for almost every war machine built after the mid-19th century, is also required in Mass Quantities to convert into Steel to build railroads and motorized vehicles - especially freight trucks.
Gold is not only an early and continuous Luxury Resource, it is also one of a few metals (copper and silver being the others) that has been used for Coinage throughout the centuries, so it's required to make Markets and Banks reach their full potential. In the Information Era, it is also a prime component of modern solid-state electronics, one of the modern 'manufactured Luxuries' and a major Trade Good.
In fact, most of the early and traditional 'Luxury Goods' in the game by the late Industrial and Modern Eras should be replaced by Manufactured 'Luxuries' such as Cheap Clothing (one of the first, from the early cloth Mills and factories), Consumer Electronics, Automobiles, Mass Entertainment - most manufactured by turning 'Raw' resources like Iron, Copper, Gold, Aluminum, Dyes, Cotton, Silk, and Wool into 'finished products' - and then selling them to other countries for Trade Gold or to your own people for Happiness or Culture benefits.
The whole resource system should be a lot more flexible and change dramatically as the game goes on with changing technological requirements and possibilities...