http://arstechnica.com/science/2016/01/the-caste-system-has-left-its-mark-on-indians-genomes/
Will our haplotype be hapless?
You presume it hasn't already happened.
I think it would go something like this
Grog Brahmins = the priest class are the moderators (delivering the lectures of the gods)
The Kshatriyas = Warriors/Kings = the Groghead founders and most militant posters in R&P
The Vaishyas = The traders and merchants so they would be the Grogy flea marketeers pedaling their lead idols and cardboard printed wares for us to spend our cash on
the Shudras = Laborers or those who toil in the sweat writing shops providing AARs and articles for the higher castes enjoyment
and last
The untouchables = Spammers, Trolls and maybe Gus or Undercovergeek? they need to be shunned and woe onto you if you let an untouchable touch you. Water wont be enough to wash that stain away
I volunteer to breed outside my Caste to increase the Gene Pool. I'm talking about India here not the Grogs.