This will probably be the Wii's last remodel ( excluding color variants and bundles), considering they've cut pretty much every corner they can. The only thoughts I could imagine for another remodel would be to make the console memory smaller, which sounds possible. But not for an entire new remodel, maybe in the really late days of the Wii ( 2014ish?), they downsize the memory.
Nintendo will continue selling the original Wii (in full-size or 'mini' form) until holiday 2013. They'll probably announce final production just after next holiday season this year and kill the console so that they can compete in every market - last-gen and next-gen - against Microsoft and Sony's consoles (assuming they're out next year). Also, after that season, Nintendo will be able to say that the Wii has surpassed the 100,000,000 mark of units sold, assuming they can get another two and a half million out by then. That should be doable because they've been doing about 3-5 million units per year for the past little while.