How come they don't make 2 stroke dirtbikes anymore?

How come only 2 of the big four Dirtbike manufactures make 2 strokes. I really don't like 4 strokes it just costs to much to maintain. The argument that it isn't fuel efficient is BS because look at BRP's skidoo ETEC snowmobiles! They are two stroke and they use the same amount of gas as the four strokes. I race motorcross and I keep seeing people with 250f an 450f with blown up motors! It costs wayyy more to rebuild one of those compared to a 2 stroke. I have a 2007 cr 125 and I want to stay with honda. I also still have my cr 85 and I have a Honda foreman atv. I have never ha any real big problems with any of them. I want a 2011 cr 125, why don't they make them?