Manual transmission were about 25% in the early 90's and still at 10% in 2007 - when they dropped way off.I highly doubt it very few people have any desire for a stick shift anymore
That coincides pretty well with Cafe. Manuals are better mileage on the highway but fall off in the city. The Cafe test is a fixed course of "mixed" driving. I say it may not be a coincidence.
I think given the choice of a potenially problamatic CVT people may have a change of heart. I doubt it would ever be more than 15%, but it could be that much.