There's a small percentage of people who can act. There's a small percentage who get to do this for a living. There's a swath of the population that are able to keep a story in their head and fight all the battles against self-consciousness and the surreal unnaturalness of acting in a movie. The technical aspects you can learn fairly quickly.
Caste is a delicate issue. It's ubiquitous, and we are full of it. We should start to change things from individual level. But when you go to people and deny caste, they may not react favourably. I think if a decisive percentage of people, especially elites, start marrying out of their caste, we may see a casteless India in a generation's time.