Though not a Hindu myself, but I do follow some of the teachings of this great culture and have had soem great Hindu friends, who often invite me to their religious ceremonies. I must say a great culture, but I would say that this religion is in decline, and I doubt if it will lats for another 100 years.
Hindu has been in decline for centuries, if you take the 300 million+ Muslims in India - they were all once Hindus, why did many convert? Ok agreed some may have converted by the sword, but not all!
What about Sikhs? They were once Hindus?
What about the Budhist? They were once Hindus
we now have new religions forming who say that they are distinct from Hindus
So yes Hindus will not exist maybe in another 100 years, that is my view