Those CRNAs hopefully recognize they have essentially been put on notice by this group. They better cover all the shifts and quit whining. They’re replaceable just like everyone else.
The CRNAs threw a huge fit when we brought in AAs in my old group, threatened to quit, refused to eat lunch at the same tables as the AAs, etc. Some of my partners fell for the antics and voted against it to keep the peace, but they were the minority. In the end the nurses didn’t follow through on their threats- there was no mass exodus and eventually all the midlevels got along fine relatively speaking.
Side note: I still keep in touch with some of my old partners and they haven’t hired a single CRNA since they brought in AAs. As attrition occurs, they add AAs and not nurses.