Answering for Indian films;
They don't care/dream bigger. Indian films don't even try catering to non-diaspora audience, and when you are targetting only limited diaspora audience, numbers will be limited as well.
A film like Dangal, 3 Idiots, PK, Baahubali 2, My Name Is Khan, etc. could have done well with non-diaspora audience, if they had planned it.
On other hand, they do try, not intentionally for China, and result is in front of us. There are atleast 10 films over $20mn in China while only one in USA, and that too can be attributed to ridiculous high tickets rate of $30 plus during weekend.