Are you a screenwriter? Just because things work that way in your industry and region doesn't mean they work that way everywhere.
I mean, we all know how companies are desperately trying to hire even mediocre workers, right? It's practically impossible to not get a decent job; even casually mentioning a hobby to a stranger on the street can net you a job offer. So why are there unemployed people? Because what I said only applies to IT workers in Karlsruhe, Germany, and most people don't fall into that category.
I'd wager that the screenwriting industry is rather unlike yours. For instance, you're probably not paid on a unit-of-work basis with a hard limit on how many projects you can do per year and ever-shrinking project lengths.
It's not like the writers are making less in terms of studio accounting. They get paid the same amount of money per episode as before. It's just that a few years ago they got paid for 20+ episodes and now they get 10 and their contracts often forbid simply working on two or more shows per season. From the producers' perspective everything is hunky-dory; they still produce vaguely the same amount of content (spread out over more shows) and pay vaguely the same amount of money to writers per season.
From an individual writer's perspective they're getting paid much less per season. I can see how they might want to take action there.
Also remember that the entertainment industry is rather famous for its use of creative accounting to keep royalty payments low. These people are not exactly known to be generous when it comes to monetary compensation.