The only way to keep 2-strokes in production is to meet the emissions regulations. The only reason that I can guess they are keeping the 2-stroke dirtbikes is because of racing. When do you see a 2-stroke in modern racing? never unless it is open class. Thats why they are discontinuing the Banshee, for the blaster they said the Yamaha was trying to design a 250 4-stroke engine for the Blaster frame but well just have to wait and see.?
Hate to break it to you, but people still run them in regular class's.