The Spitfire product range is huge, and (in my opinion) has simply masses of products that overlap. I think there is little to be done that they haven't already done in terms of traditional sampling.
They (and all other companies in the VI business) can create new products designed to be a lot more complete than the current ones. Using such products would be a lot more satisfying than dealing with the combination of overlaps and incompleteness.
After all, those who have bought several/many libraries won't need many of the instrument sections they have paid for. The reason it's easy to end up with eg. 30 variations of V1 legatos of which we use maybe only 5 is that we often have to buy a full ensemble when all we need is eg. a better bass pizzicato.
There's a reason why we usually can go to a shop an buy eg 6 new teaspoons (or one at a time) without buying a lot of knives, forks etc: we don't need all those overlaps or unneeded extras. That's why I think the new Abbey Road strings, which are sold one section at a time, and (even better) the Orchestral Tools solution (which allows us to not only buy eg. only the violas, but also has an elegant solution for downloading only the mic options we need) are good examples of how shopping usually works: we buy only what we want to buy.
For instance, I like the bass pizzicatos in Spitfire Studio Strings, and believe I don't need the other sections … but if I could buy the basses, maybe I'd want to buy more from the same library. That's what happened when I bought the OT Tallinn cellos: now I'd like to have the basses as well. I really hope SF moves in that direction, especially since they don't have downloadable demo presets (like Performance Samples), 30 day trials (like VSL), trial subscriptions (like some companies) or a la carte shopping (like OT) – except for the new Abbey Road sections and possibly only a few more libraries.
I'm sure they have designed their shopping model the way they have in order to generate more income. But at least in my case, it has led to me almost never buying SF stuff anymore, even if they are one of my fav. VI companies.