I would buy this. It would be like the Thunderstone game system.
It would be a themed box that would hold sleeved (FFG sleeves) LotR LCG cards and other game components. It would come with themed labeled dividers for all the types of cards and expansions (up to what is in print). Future expansions would come with the appropriate dividers or they can be sold separately. The box should be big enough to hold the base game plus a few cycles of expansions, generic enough to buy more boxes as needed, or themed for each cycle.
I am sure this has been said before and I like all the custom boxes people make, but I love FFG products.