well there wont be a new msc, but even if there is this is irrelevant.
a new msc would be released solely on wiiu, which unlike wii operates via a nnid (nintendo network id), and you could add anyone you play at any time simply by searching their nnid. you wouldnt need a way of contacting them and asking their fc, you would just add it yourself if you really wanted and they could either accept or decline.