There are so many cases of people that send moneu to 'their kids' (which were actually) scammers when they got contacted by a new number via WhatsApp saying: "Hey dad, I have a new number, can I ask you a favour?".
With voice spoofing this will only get worse.
There are known cases of companies that fell victim of this already.
And it will surely be targetted to end users too. I worry most for the kids and elderly in this case.
A way to weapon them against these attacks is to agree about a 'code' only you know. Your loved ones could ask for this code whem they doubt that it is you they are speaking to.