I guess we'll see if Madara can really supress the Kyuubi in Naruto and potentially make Naruto his new pet, even if he doesn't use the chakra its still inside him so he'd still be affected.
I also think Minato knew more than the average Joe about these events, though he probably tried his best not to use the Shiki Fuuin because he'd die plus what if he wasn't able to seal all the "infinite" Kyuubi chakra then there would still be some Kyuubi left over while he would be dead. So seeing as no one was able to put a dent in Kyuubi he finally used it.
I bet Naruto will only be able to beat Madara by "harnessing" the Kyuubi and adding his own strength making some kinda weird purple chakra or something stupid like that. Cause Kyuubi can't do it alone and Naruto can't do it alone, typical
shonen manga plot ending.
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