Not sure if this was discussed in this thread already, but I don't think Nissan will come out with a manual trans, if and when they make the new Z.
Being very realistic, the C7 sells around 3k a month, and that's the best selling 2 seat sports car. So even if Nissan could somehow match those numbers and 1/3 decide to get a manual trans. That's only 12k (and that's a far stretch) for a whole year. I just don't see how Nissan would get the go ahead from Carlos Gohsn to approve a new manual trans for those numbers.
I guess for those of us who have a 6mt, we'd better enjoy it.