Give it 5 years. The xiaomi or LG above the bed is likely already watching and listening. Interesting how the taboo shifted from "no camera in the apartment" to "no camera in a bathroom". In many short term rentals you have outright always connected IP camera installed inside apartment because of "break ins", "squatters", etc. The owners don't see a problem, don't accept complains.
Those IR sensors are basically cameras; they are wired up for power, they trigger with your image.
So don’t act all surprised when they are hacked and subverted to the visible spectrum and recording capabilities.
So it matters not whether it's one pixel or 50 megapixels doing the work there, what matters is that everyone who attends a baseball game or eats at a restaurant is accustomed to a conscious machine that can "see" their buttcheeks well enough to know exactly when to activate the flusher without any pesky hu-man touching it.
And that there is electrical power and, probably, networking available in the restrooms so that the conscious machines can stay alive and discuss buttcheek sightings with one another and their mothership.
If I have a thing, that thing should obey me. Be it a crowbar, a PC, a smart lamp or whatever. It's a value in and of itself that I can trust in my things. What about criminals? Sure, it is convenient a car can spy on a criminal and tell the police where they are, but we shouldn't allow that. Just like it would be convenient to force priests and lawyers to tell there secrets, but we as a society decided that there is greater value in confidentiality.
I mean especially for a society like the US which is traditionally individualistic and distrustful towards government etc., it should be a matter of principle that "my stuff" doesn't spy on my and serves me and no one else.