I've always agreed with you on 250cc being a magic displacement marker for selling in the US. I think if they could offer these new 250's for NO MORE than 3,000USD the would fly like hotcakes.
Same is true in the UK and I think most of Europe, where the bike needs to be under 20KW (I think it is) for new riders. Also in Australia and I think NZ where you have to do a 250cc license first then pass your full license after a year or two.

Qingqi would be well advised, as would Sundiro, and all the other manufacturers with joint ventures, to beg for the designs for their sister companies' most recent reliable 250cc preferably air-cooled, fuel injected single designs. If they could make lots of these and bring the prices down and reduce the amount of smaller bikes they make they would do better in western markets. Would an injected 250 single cost much more (in fuel economy) to run than an older design of a 125cc with a carb?