For everyone asking the Kanye x Nike "What's holding it back?" type of question, think of it this way.
At the end of the day, Nike is and will always be about the performance, at least in terms of how it markets its products to the consumer. Every few years, when they introduce new technology, it's not strictly for aesthetic purposes. Nike, let's give them some credit regardless of how you feel about the Swoosh, is trying to give you the most advanced sportswear available (at least give you that impression).
That being said, Kanye's shoes have ALWAYS released when he's touring. While that might seem like simply just "convenient//smart marketing", I'd be willing to bet that has a huge role in when and if the sneakers are released. Nike has made it a point for both shoes to stress from their end that the Yeezy 1 and Yeezy 2 were "the ultimate performance sneakers for the ultimate performer"... or something to that extent.
They're not gonna let Kanye have a capsule unless he's "active" and Ye made it pretty clear recently that he's focused on this agenda first, music and everything else secondary. I cannot ever see Nike allowing Kanye to have his own "line" without him being actively touring.
Now, if he weren't so God-like, maybe Kanye would have done something smart... like allowed NSW to do all of his tour wardrobe (say what you want, I like MMM as much as the next guy, but NSW would have killed it) then maybe they'd be more open to working with him long term as a partner.
Kanye's got to face it. Nike > Kanye... and it's not even a close race.
I won't be surprised if he takes the Adidas deal. They'd give him free reign to do WHATEVER.
Kanye will never bring in half the money Nike makes on LeBron James alone and they know that, too. That's why they're not really sweating this. At all.