Since the releases of P6 and now of P7, new Poser content does not work in D|S (properly I should say) as these products usually require Poser specific shaders, nodes, & materials. As much as I would like to buy such products, I hardly spare them a glance.

If the products have textures included with them, they should work fine. The only difference is that you won't be able to use the material room enhancements, so your renders may not look exactly the same.

So I wouldn't say that DAZ Studio users are being left out, per se ... the products should work (that is, if they are conforming). You just won't get the added benefit of the material room, but the textures and bump maps, as well as displacement maps, should work. Products submitted at DAZ should also include DAZ Studio-specific material files as well.