I feel the % would vary before and after articles are ready for a split off. I agree with Piotrus that India section should grow, so should the current coverage of alternate sociological/anthropological theories on caste. Initially, it may have larger section on rest of the world. As the article splits, and the content stabilizes, we may end up with a balanced and consensus for a complete and quality article. We do not have to decide or debate % now. 
 :I am fine with keeping the article about the current size, splitting out specific sections into independent articles with good, balanced, NPOV consensus summary in this article. FWIW, I just took a rough look, after deleting some parts, splitting off some sections and summarizing it here, setting aside about 5% for lead, I arrive at relative % that is quite different than above proposal.