The technology is available and surveillance will be done illegally, as it was done in the case where Snowdon blew the whistle. There is no escape.
The only thing that would lessen some of the damage resulting from invasion of privacy is if there were laws banning any legal action using what was found on illegal mass surveillance. And if it is found to have been done, those responsible should be indicted. Of course, it’s not easy to enforce such rules eapecially when there is government corruption and double dealing, but it’s better than nothing. At the very least such surveillance recordings should never be allowed as evidence against any defendant in a court of law, no matter what the charge. . And laws protecting whistleblowers should be strengthened. Of course politicians and lawyers will try to carve out exceptions, as they always do.