I’d think it would be a pretty key area for expansion though, just given the sheer size of India’s population and their growing wealth.

I don't know, the growing wealth is still a good way off from becoming a ground for Apple to become very popular. Especially since the market has been heavily invested in Android devices due to the pricing disparity, it's a big jump and likely not one that can be alleviated simply by waiving some of the extra costs by manufacturing locally.

The most popular phones sold in India are low-midrange devices in the USD $80-400 range. It'll take quite a push from both the public and Apple to bring sentiment to a situation where Apple products have appeal. As it stands I'm not sure the demand will ever be there.