There is really no point in predicting what Wii sales are going to be because the fanboys are just going to use excuses.
Wii Sales increase: SSBB really moved units, see told you microsoft was allocating units/stockpiling/etc systems for JP.
Wii Sales remain same: SSBB didn't move units because they were air frieghting units in Dec/Supply Constraint/Stockpiling for U.S. launch/some other excuse.
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So many excuses made, I'm starting to think that Wii Fanboys are former workers from Sony's PR.