China market is big by itself and could support a fleet of these aircraft. The only problem is the certification mayhem to go and sell abroad.They've sanctioned the Boeing and Airbus airplanes in Russia. And also the subsystems that Russia was using to produce their domestic airliner.
Even the C919 is suffering because of issues with US sourced subsystems.
So I agree that China has to ensure that there are no Western components or subsystems at all in the CR929. China should have enough experience now (with the ARJ-21 and also the C919) to develop domestic alternatives and should have a large enough market to support this.