If something is possible, and this simply indeed is, someone is going to develop it regardless of how we feel about it, so it's important for non-malicious actors to make people aware of the potential negative impacts so we can start to develop ways to handle them before actively malicious actors start deploying it.
Critical businesses and governments need to know that identity verification via video and voice is much less trustworthy than it used to be, and so if you're currently doing that, you need to mitigate these risks. There are tools, namely public-private key cryptography, that can be used to verify identity in a much tighter way, and we're probably going to need to start implementing them in more places.