It's a very delicate situation for other countries to get involved without major consequences. First, more evidences of these camps are needed. Unfortunatelly it's very hard to have concrete evidences from what happens behind the curtains in China, as it's a very closed country where the government watches everything going on very closely.

It's also unlikely investors and businessmen from other countries will left China for this reason, as it's a very profitable country anyway, full of cheap labor force, which generates a lot of profit.

I see a more appropriate resolution would consist in a pressure from the religious groups from another countries over China's government. Even being a communist dictatorship they won't want to have issues with international trading partners communities, especially muslim communities, as they have some common interests with chineses towards the occident.