AC HD - 398 'Y' pax, with 6 lavs
UA 777 - 306 'Y' pax, with 6 lavs
AA 777 - 246 'Y' pax with 8 lavs
Imagine this - 50 minutes before landing, you're thinking "Hmmm... I should probably pee." Then the pilot comes on and says "We're anticipating turbulence, so we're going to turn the fasten seatbelt sign on early... you've got about ten minutes."
You're now competing with a whopping 65 people per toilet.
Hell to the No.