the only reason to change india's uhv is to make it more historical. which founding any western religion does not do. Currently it provides a unique challenge that I can see being fun for certain types of players. The key to making everyone happy imo, is to find a happy medium.
Perhaps if founding the three religions is too easy then a way needs to be found to make a second uhv that accomplishing the first one makes it more difficult, so that a new challenge is created: how to balance the two. So to accomplish the first goal requires you to beeline monarchy to get before the Persian spawn, maybe the second one needs to require techs in other branches of the tree for example.
Currently, India is one of the more difficult UHV imo (one of the few I can't beat). India as one of the worlds oldest continuous civs deserves a unique and challenging gameplay. Imo, if a really good change can not be found, then it should stay the same.
also, if the date for the temple UHV was early enough then waiting and hoping for religion spread would not be possible. In my perfect civ world, India would have an early game condition based on religions (founding, spreading or Great Saint birth), a mid game condition based on culture or GP's and a late game condition based on population, economy or unity. So i would like to see either a religion founding condition OR a temple building condition that is made so founding religions is necessary, but not both.