I think the only way new browsers are going to succeed in the future is if they adopt some major new technology that the mainstream browsers either will never use, or will wait many years until they consider it. Perhaps something like IPFS or some blockchain technology, or anything like that, that is proven to work well but the mainstream browsers still think it's too new and risky, or perhaps just don't want to piss of the MPAA, which by the way, is now a member of the W3C.
The new browsers will need to allow for significant new possibilities, for users to want to adopt them.
The new browsers will need to allow for significant new possibilities, for users to want to adopt them.