Its the Bitcoin SV that doesn't have a replay protection and BCH holders should be extra aware to follow the devs guidelines to be secure.
Though I'm not a BCH holder, I don't think BCH would be dying this easy, BCH is one of the highest utility currency as it's one of the top 5 accepted crypto on retails.
Perhaps, Bitcoin Cash will survive while Bitcoin SV would die in the long term. Or maybe both chains will survive just like what happened with both Bitcoin and Bitcoin Cash. Having no replay protection is extremely risky for BCH holders, especially for newcomers in the crypto space. However, I think that wouldn't be much of an issue since the number of users transacting on the BCH network is much lower in contrast to Bitcoin.
The most important thing here is that even if Bitcoin Cash were to fail in the future because of Bitcoin SV, Bitcoin will always be the original "Bitcoin" no matter what. If you were a hodler of Bitcoin before BCH's inception back in August 2017, you would've had both BTC and BCH on your portfolio. I would advise to sell your BCH to BTC just to be safe before it's too late. I believe that this splintering will result in a very messy situation leading to the destruction of BCH's image and reputation (if any) within the cryptocurrency market. It'll show the people that its dev team and community are not unified as Bitcoin's in terms of protocol upgrades to help advance the cryptocurrency for the long term.
Right now, the next fork would be Bitcoin SV, but I guess that Bitcoin Cash will continue to fork until several useless coins are born. It could be Bitcoin Craig, then Bitcoin Trash, Bitcoin Crap, and so on. You name it!
