Contracts have lots of standard clauses or near standard variations of such, and as a consequence plenty of "dumb" template based generators already exists, and you may come across contracts that have just the occasional line manually written.

At least one company already integrates or is about to (not sure if it's in production yet) LLMs in theirs to do effectively smarter completions.

It won't be fully automated any time soon, but it will certainly eat into a lot of the simpler work.