The KC plant made Streets, the now-discontinued Dyna, the now-discontinued V-Rod, and Sportsters.
So, yes, with most of the product lines they produce being discontinued, and with my GUESS that the Sportsters are going to be all new this upcoming year, you can certainly see why they might consider the KC plant ripe for closure and consolidation with the York plant. York makes Touring, Softail, CVO, and Trike models (so, all the top-dollar expen$ive stuff).
The Street is one of the most important lines to Harley's future, but it hasn't caught on in the US as well as they would have liked. Worldwide, the US accounts for only 2% of the motorcycles sold; the Asia/India area accounts for an astounding 84% of all motorcycles sold. Which explains a whole lot about why they'd establish a Street plant in India. Harley NEEDS a model like the Street to have a prayer of selling anything to the world's largest (and fastest-growing) motorcycle market.
So I don't think the Street is in danger of being discontinued. But will all Streets be made in India after the KC plant shuts down? Seems like a reasonable manufacturing concern.