Frankly, we were tired of waiting for Stripe to come and improve the payment ecosystem that existed in India :D
On a more serious note, Stripe has only entered payments markets that are similar to US. India is very different from those markets and for tackling it they will have to modify the product significantly to meet the regulatory rules like 3D Secure and support the dominant local payment methods. And if they do try to do that, we will still have a couple of years head-start.