The discrimination the catholic church in China suffers is hardly talked about. The intimidation by the Chinese state on the church is incredible and many members have been killed or incarcerated for maintaining the independence of the church from the Chinese state.
On human terms it makes no sense to continue church operations in china just like some companies pulling out of china, but the church has not run on those terms.
For centuries the church and her members in China struggled to maintain their identity in the face of discrimination, and there has been progress even though small. I don't think it makes sense to let go of a winning strategy albeit a slow one given the conditions.