Please show my proof or a citation that the "us does not produce enough tech talent to sustain its position in the world" It seems to me that every year for the last 15 years the US produces new and innovative tech tech companies many very successful. How is this possible then if its not sustainable?

That's a straw man that not buying into the nonsense that without H1B visas the tech economy will grind to a halt means isolationism. The U.S. is a nation of immigrants, diversity is not an issue.