No it should be writers'. But I cannot edit the title of the thread. Oh well.
I'm going off topic. I apologize. The true use of plural possessive dictates that you add an apostrophe and the letter s. But due to media and whatnot we've become less grammatically correct (think of adding the comma when you have 3 of something and you have an and before the last--> red, blue, and green. However, we often see now that the last comma is being dropped).
Another reason why I hate the way grammar and usage is taught in middle and high school is that we're given definitions instead of doing our grammar within paradigms. An example would be that adjectives describe a noun. If you have a cheese sandwich, then cheese would supposedly be an adjective because it describes what kind of sandwich. However, since we're given the stupid definition that a noun is a "person, place, thing, or idea" then cheese is a thing and is not an adjective, but cheese is a noun. So we have a noun modifying a noun.
I'm done.
p.s. I love my union.