There are creative teams coming out of college not knowing who's the writer and who's the art director. Fine up to a point. Why make a distinction when the best answer is a great idea that can come from either or both? Unfortunately, it's a more naive and unrealistic position than ever.
Most creative work these days from TV ads to banner ads, from email to radio, from posters to websites, demands words. Some of it demands a lot of words, such as the leaflet explaining home insurance or the web page introducing 'member benefits'. In fact, the web has led to an explosion of copy with online interaction still predominantly a text-led experience.
Employing the best writing craft in all these cases will have a direct impact on the ROI of a campaign. And many consumers, especially those over 40 (i.e. the ones with all the money) still appreciate correct English. So do all clients I've ever met. A basic grammatical error or obvious spelling mistake reflects badly on a brand and erodes its 'trust and reliability' values. If you don't believe me, get a job writing for the BBC or Daily Mail and use "it's" when it should be "its". See what happens. Even the tortuous copy sometimes created for SEO can still be correct English.
Why can't young creatives write compellingly or correctly? When I last looked schools still taught English. Yet when I take the IDM's Introduction to Copywriting course I find most of the delegates (predominantly young clients) would actually prefer a course in correct English (punctuation, grammar, spelling etc) rather than good copywriting. To be a copywriter, you need to master both, although many wrongly assume one equals the other.
Writing is a great career and you don't find many halfway decent writers out of work. And if you still want to work in a team, sort out who will write and then become brilliant at it. You'll always be in demand and you'll have a great career.
P.S. Thank you to Jon Allen for correcting my English in this blog.