No, it's a happy day. This won't be the last such event. People who care will learn to keep track of details they care about, and certify -- and de-certify -- without drama. Not all modules are right for use everywhere, but all are right for use somewhere, including those only trusted for personal projects.

Some of the latter will be forked, and the forks certified to higher levels, and those forked again and the forks certified or de-certified again.

This marks a step on the way to maturity, right on schedule. By the evidence, in ten years Rust will be a mature language, much more quickly than some. Most don't get there.