How is it not a negative impact to the premium-cabin experience? You will have a free-for-all of passengers up & down the aisles. While the initial reason Y pax weren't allowed to use the F bathroom wasn't actually related to traffic but more related to keeping people away from the cockpit door post 2001, I sure as heck don't want to hear the constant hollow floor clunking every time someone walks past me on a LH/ULH flight. It's already bad enough with the J pax.
I don't like this change one bit if it's for real. I'm flying transcon on Nov 2 so will listen to whether the announcements change or not.
And will it be announced via the FA that all pax can use any lav? Or will they just drop the wording of using the lav in your ticketed cabin?
-RM