China can benefit in the short-term if talent moves there, but it's very difficult to gain citizenship in China if you're not ethnically Chinese. That probably won't matter for people just moving for work, but those looking for a better life for their children or a home would likely consider it a blocker.

There are millions of overseas Chinese descendants who already speak Chinese and are wholly or partly ethnically Chinese. That would be an easy pool to draw from first.

For example Terence Tao speaks Cantonese.