its not that easy to just "invest" in infrastructure and manufacturing. Every year that is delayed, it gets harder. That is because the state of the art in manufacturing moves quickly, but worse, builds on previous knowledge. If you just invite Japanese companies in, sure, that'll solve employment, but that doesn't mean India would be a strong manufacturing country.
Services isn't that way. I program in C. I don't need to know assembly to program in C. For the purposes of my work (numerical analysis and modeling), I can pick up a book on C, pick up a book on numerical analysis, and within 1 month be writing useful software. Within a year, someone could learn several languages and be up to date on most recent techniques.