Mass reporting is a problem on the internet and at Twitter that long predates Musk. This all comes down to your assessment that he's running Twitter poorly, and that this is therefore a new risk. I completely disagree, so I'm not worried about these people over the long term.
Furthermore, coordinated censorship by the platform itself is now over. Even if Ben Collins were accidentally, temporarily banned over mass reporting, I wouldn't lose much sleep over it. The status quo is better than the status quo ante.
Ideally, both cases are handled properly. I have faith Twitter will be able to achieve this.