Global population would be hundreds of millions lower.
India would have significantly fewer people, and would be poorer overall - though it did have its own indigenous scientists, many of whom worked with Borlaug. Same for Pakistan.
Mexico might have had a civil war or otherwise be a failed state.
Many similar effects in other parts of Asia and Latin America, though not to the same degree. Less of an affect on Africa, where Borlaug didn't do earlier work and proposals to organize agricultural reforms were blocked by misguided blockheads in western countries.