As we have said before (and have for years, like I used to whenever the Timurids were brought up) we also recognize India is in need of attention in the future. It is not the only region to be in need of that however, so all in due time 
Like with all regions concrete suggestions are welcome and will be revisited when we do get to that region at some point. That’s also more or less what this forum is for so by all means make more of them for all topics you have something you would like to suggest something for (not just India).
There has never been strong reactions against adding non-European content for eu during my 3.5 years on the project. Quite the contrary. That is as far as I know mostly a thing in the ck community (and that community is off topic to discuss here).
Given that this is a suggestions forum for what could be done in various ways with the game I would not worry about discussing stuff like popularity, we have better ways to judge that.
We come here for the suggestions themselves.
Like with all regions concrete suggestions are welcome and will be revisited when we do get to that region at some point. That’s also more or less what this forum is for so by all means make more of them for all topics you have something you would like to suggest something for (not just India).
I bet that India DLC will receive lukewarm reception similar to Rajas of India in CK II. Can't see any useful feature that will improve the game that can be measured with India improvement if we talk about regular DLC. Another Immersion Pack may also be seen negative and not useful, because Indian countries are far more rare choices to play in comparison with Russia or England/France//Burgundy/Dutch minors.
There has never been strong reactions against adding non-European content for eu during my 3.5 years on the project. Quite the contrary. That is as far as I know mostly a thing in the ck community (and that community is off topic to discuss here).
Given that this is a suggestions forum for what could be done in various ways with the game I would not worry about discussing stuff like popularity, we have better ways to judge that.
We come here for the suggestions themselves.