It was pretty weird to expect DMC5 to appear at TGS, considering they only just said that the future of the series is uncertain (which could mean anything, btw). It could mean they're tired of DMC for the moment, and heck, it could simply mean they have no ideas for DMC5's story and/or gameplay yet. For all we know, they're trying to steer clear of Devil May Cry for now, because it's not guaranteed to make them a huge profit (well, not like their run of remasters and remakes, anyway). It could also be that Devil May Cry (or Capcom themselves, probably) has negativity surrounding it that needs to cool down a little bit more, otherwise people might not have faith in DMC5.
From what I've seen in DMC4 SE -- and from Itsuno and Kobayashi's statements -- it seems clear that DMC5 WILL be developed and announced at some point. So it wasn't teased at TGS, big deal. Why does it always have to be either the best or the worst case scenario? Every time DMC5 doesn't appear somewhere, it's ''OH NOES, DMC IS DEAD (AGAIN)!!'' By that logic, I could rant about many game series being dead just because I didn't get a game within a year. So calm down. Nobody said anything about DMC being dead or being likely to be dead.
As I said, Itsuno, Kobayashi and DMC4 SE actually implied DMC is far from dead -- that they'll actually return to it eventually. Why would I assume they're just lying? And are we so spoiled we can't wait even another year? Capcom considers DmC part of the Devil May Cry franchise, meaning the last Devil May Cry was from two years ago, not eight.
I'm also kind of hopeful about it, considering Capcom appears to be on the right track, judging from some of their recent decisions.
that's close to 10.
