It is probably to tie-in with Wreck-it-Ralph 2. I’m quite sure the next thematic contest will be related to that as well.
@RT98, you could simply opt out of the queue nd get a 2 day break… Sure you will miss out on the daily reward but if it became a mandatory break, u’ll miss out on it regardless.
Furthermore, you need 7 wins to reach legendary. In a month, you’ll only get 15 wars. So you can afford to lose 8 (or half the war). If the break became mandatory, you’ll be left with 10 wars and only allowed to lose at most 3. With the current MMR system where you could potentially be paired with guilds that are way out of your league, you can see why that would be a bad idea.