It has not been normal until the last few years for people to typically have an Alexa-like device that is always listening for the "I'm about to make a request" signal, which frequently gets turned on by accident.
It's not ridiculous that someone might conclude in the future, "if you're in someone's house with such a device, you should reasonably expect that some part of your conversation might get sent to the third party", which would mean a diminishing of the right to such privacy in 4th amendment jurisprudence.
And frankly, the whole concept of using voice to activate it is reckless. It is unavoidable to have significant false positives. It should be done with a non-audio signal that can't be faked (up to the limits of modern crypto), like an authenticated EM signal to turn on the listening.