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Anyone have any stories, ideas, facts, or opinions to share on this question? ;)
Hyperthreading was a nice idea, but it's done better in newer CPUs such as Sun's Niagara chip.
Much better to get multiple cores if you want the extra speed and your workload is suitable.
They've made enough improvements in other areas to more than make up for the loss of hyperthreading.
There is always a tradeoff in processor design - how can the chip real-estate be used to maximum advantage? x thousand gates for hyper-threading vs x thousand gates for more-effective pipelining, for example.
Going with hyperthreading means limiting yourself to obsolete processors. There really is not a choice here.
It certainly may come back at some point in the future, but for now those are the facts.