You do not know what you are talking about.
For starter, there is no such thing as 'low quality' but there is LOWER quality. Soviet/Russian airliners were and still are notorious for being of LOWER quality than their Western aircrafts. The quality we are talking about is not confined to aircraft design because the Soviets/Russians produced many of the world's finest aerodynamicists, but that of long term reliability and maintainability. The latter two items are independent of aerodynamics.
Now, if the Chinese government demands and even forces Chinese airline companies to use exclusively Chinese aircrafts, then a market exist regardless of quality.
Of air traffic controllers, US in particular and Western in general, prefers Boeing or Airbus, not because those two companies are Western but because they build excellent aircrafts. Soviet/Russian aircrafts often have a difficult time with speed, forcing Western air traffic controllers to make extraordinary efforts in managing TO/L schedules. If a Soviet/Russian aircraft develops hardware problems before takeoff, most of the flying day's schedules must be renegotiated. Inferior airspeed changes is just one of many items that everyone must deal with.
Most people do not realize that an airliner's business model is built upon the aircraft ( or aircrafts ) it has. The higher the quality of that aircraft, the better the odds of business success.
