I'd say your prediction and reasoning are very sound.
I'm not so convinced that GH:WT will beat out overall sales of RB2, though. Rock Band has the advantage of getting there first. Also, there are a lot of people who already own a full set of instruments for it, while buyers of GH:WT will only have guitars (if that).
They're both excellent games (excepting the Wii version of Rock Band), so it should be a fun race to watch.

"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
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