If the Writer's Strike 2007-2008 is long, new cartoons for the 2008-2009 TV season could be delayed or something.
I know the 1980 actor's strike delayed ABC's new Saturday Morning lineup for 1980-1981 (with Fonz and the Happy Days Gang, Richie Rich/Scooby Doo Show, Thundarr the Barbarian, Heathcliff and Dingbat, and the Plastic Man/Baby Plas Super Comedy Show) until October-November 1980 as well as 2 of NBC's Saturday Morning 1980-1981 shows (The Flintstone Comedy Show didn't premiere until November 1980 and Space Stars didn't premiere until the 1981-1982 NBC Saturday Morning season), The 1981 writer's strike and animator's strike delayed the 1981-1982 Saturady Morning lineup debut of ABC's Laverne and Shirley in the Army until October 1981. The 1987 cartoon voices strike delayed the start of ABC 1987-1988 Saturday Morning lineup cartoons Little Clowns of Happytown, Little Wizards, and All New Pound Puppies until the last weekend of September 1987 (the same weekend NBC premiered on its Saturday Morning lineup for 1987-1988 an animated version of ALF). And finally, though not cartoon related: The 1988 writers strike put Pee-Wee's Playhouse in reruns on CBS Saturday Morning 1988-1989 lineup for that season (except for a Pee-Wee's Playhouse Christmas Special in December 1988 and 2 new Pee-Wee's Playhouse episodes in March 1989).
What about writers of Canadian produced cartoons (from the studios of Nelvana, Cookie Jar/Cinar, and CineGroupe) and British produced cartoons (I wish there was a revival of Dangermouse by the Brits and BBC!)? Are they seperate from the American WGA? Of course Canada had its own Actor's Strike lasting about 2-3 months earlier this year.