Even if India and China have the infrastructure to support the hosting of the world cup or they have the funds for it as long as they never bid themselves forward as organizers, is it possible for FIFA to appoint one? It seems that it is impossible because FIFA only appoints countries that volunteered because it means they have the ability or desire to become the organizer, because it seems that at this time FIFA is no longer considering the development of football from the countries that bidding to be the host, so every country currently has the opportunity to become a host as long as it has the funds and FIFA sees an opportunity to get bigger profits there.
Well, profitability is a big concern if the matches are being scheduled in India. Because the government never makes these events tax-free and it won't be acceptable for the FIFA. And football is not the most popular sport in India, unlike the case with most of the other countries. And given the current political climate, I don't think that the Indian government will take a favorable view of hosting the event in their territory. In case of China, the scenario is more viable. The government is more supportive compared to the one in India.
I think it's not about that, Qatar is not a big football nation neither and they got it, and considering how big and how amazing it is right now and we should be considering how "wealthy" they are as well, I know not all the same level but as a whole that's one of the biggest and best nations in all of the world, most talk about USA and China and all that, but nobody could deny that India is one of the biggest as well.
This is why I believe that we should be considering them to host it as well, wouldn't be that impossible. I would prefer an Indian world cup over Qatar one for example, and it would be a lot better to visit because if you go to India you know that there are a billion places to visit that is amazingly lovely to see for any tourist in the world.