I just think that's a really hard sell with them pushing either wireless or Lightning headphones and other accessories right now. I mean they hype of an incredible redesign could overshadow that, but it would be a big hit, IMO.
EDIT: I'll ask a very uneducated question and hope not to be mocked, but how different are the plugs/ports for USC-C and Lightning? By that I mean, could they somehow engineer one port that could fit both plugs? That would be an interesting move, if it's possible. Just not sure it would fit in an iPhone frame if it even was technically possible.