Silverthorne, as a product line comprised of both a separate small die design and a downbinned and defeatured Penryn, might make sense. It's at least plausible.
It could make sense, if one of the main goals of the UMPC platform (aside from low power) wasn't to have a small physical footprint. Supporting a die ~4x the size of the original would either mean two separate sockets (no indication so far) or wasting space half the time (not likely given the aggressive roadmap for reducing total area).
It's circular reasoning anyway. Klaus brought Silverthorne forward as proof for his excess variability claim, so you can't use the excess variability claim to make it sound more compelling.
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