You must be daydreaming, being a mass manufacturing base requires not only the low labor cost ,more importantly it require advanced infrastructures and energy, power supply which India is decades behind of China, the backwardness in infrastructure alone would push the cost of the product big time. That's why Indian products are much more expensive than the Chinese'. You just don't have this unrivaled Chinese efficiency.
In order to become a manufacturing powerhouse ,China for decades invested heavily in building roads ,highways, railways, airports, ports, power plants, efficient supply chains... now China has the world's best highways, railways, ports, airports...those make the production and transportation super cost efficient .There are tons of poor countries around the world and not everyone of them can become a manufacturing hub.