Yadavs have no caste. Yadavs are not Brahmin. Yadavs are not Chhatriya. Yadavs are not Vaishya. Yadavs are not Sudras. And they are large in number. They dominate the Hindi belt in India.
The question, is the Hindu religion possible without the caste system, it is not even a question. Of course it is possible.
It is not a coincidence that the only form of Hinduism that is out there in any missionary position is the one that flows straight out of Krishna, who is considered the Founding Father of the Yadavs. The Hare Rama Hare Krishna people are out there preaching. When you join, you simply become a Hindu, you have no caste. You read out of the Geeta, the crown jewel of the Hindu worldview.
But just like the Brahmins annihilated Buddhists from the subcontinent, they also tried to annihilate the Yadavs. They did manage to in Gujrat, where Krishna was from, where Gandhi was from, where Modi is from. Both Gandhi and Modi are caste Hindus.
Caste Hindus think of religion as geography. They don't feel, there are a billion Chinese, if I can get half of them that will be 500 million more Hindus. They don't care which way the Chinese go. They feel everyone on the subcontinent was once a Hindu, and so any deviation that happened anywhere along the way needs to be corrected. Which makes for amazingly intolerant, obnoxious behavior, like asking Muslims to "come back."
Bramhins are weird. They are supposed to be these learned people, people of the book, but they also have been the most mercilessly bloodthirsty. They have killed like it was nobody's business.
Yadavs also seem to be able to form political alliances with Muslims rather easily. Neither the Muslims nor the Yadavs are part of the caste framework. They have nothing to break out of first.
But I don't see any Yadav in Bollywood. Maybe the good looks stopped after Krishna, who was supposed to have had a thousand girlfriends. Laloo ne sab jagah aarakshan lagoo karvaya, Bollywood shayad bhool gaye