On Latin--it must come from the top
There are some Latin terms we could all get rid of: inter alia comes to mind.
But although I advocate getting rid of all Latin in legal writing, you can't just suddenly abandon subpoena, habeas corpus, and mandamus. When writing for a legal reader, you should use the recognized terms of art.
If the legal profession is to abandon all Latin, it must come from judges. Once judges begin saying "order to testify," then we can abandon subpoena in writing for legal readers. That day may never come.
I'm focused on abandoning Latin in writing for nonlawyers.