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Let me see if I've got this straight... Daz Studio now has a 64 bit version, but the renderer ... doesn't even have GI or Radiosity.

Wrong. You may be thinking of Poser Pro. Daz|Studio 3 (via 3Delight) features global illumination, caustics, and subsurface scattering.

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If they already own a superior renderer with Carrara, why are they wasting time on 3d Delight?

Carrara's renderer isn't superior to 3Delight, although it does have definite advantages for hobbyist users. The reasons they aren't integrating Carrara's renderer into Daz|Studio are:
(1) Carrara's renderer is very tightly integrated with the rest of Carrara's codebase, and
(2) It would also require a major rewrite of Studio itself in order to integrate such a different renderer.

You should also know that up until recently, I've been heavily biased in favor of Poser. And yes, Smith Micro will need to bring their A game this time.