Its been considered and discussed plenty of times before
Trouble is the amount of work that it takes to port even a simple app, let alone something like MC12.
I will say this though- Both Linux & Mac are sorely lacking in a decent all in one media management app. Yes, there are programs that'll do music libraries, and plenty of video players, but there is no all in one killer app.
Market niche possibly, but would be a huge amount of work, for an uncertain return.
Final FYI- The internals of any distro are fundamentally the same, all that should be needed is the right libraries installed.
While I do support a *Nix version, unfortunately its not really going to happen any time soon. (Unless JR say otherwise anyway
)
Apologies, now responding to the person below me
FFDSHOW et al are not really a problem on Linux, but do pose some potential obstacles. The whole trouble is that several of the widely used windows codecs (WMA/WMV, MP3, DivX etc.) are non-free, with by default Windows only binaries. There are Linux versions, either using the Windows files, or reverse engineered bits, and the strict legality of these is sometimes questionable. (Largely America, stuff to do with the DMCA iirc) This can be got around by installing the appropriate W32codecs package for your distribution, but its one more thing that has to be considered.
-Leezer-