I hope they get rid of it completely. People on r/locallama and others have made much better assistants using GPT which use iOS APIs to control the phone. It's ridiculous that Apple still hasn't done anything useful regarding Siri.
And even then, the activation keyword is likely to be whatever Apple says. Similar logic as 3rd party keyboards, don't want user input to get stuck on even merely potentially untrustworthy or buggy code.
The rumors were true.