Those were WiFi routers inside the room. They didn't see through walls.
Unfortunately, I don't see how the logic wouldn't basically be sound based on the existing criteria that, if technology existed and was in widespread public use that allowed ordinary people to routinely see through walls, then yes, being behind a wall would not give you a reasonable expectation of privacy.
Assuming we ever reach that point, the Supreme Court would either need to come up with a new test of what constitutes a search or we'd need to ban such devices so people could still expect privacy in their own homes.
Unfortunately, I don't see how the logic wouldn't basically be sound based on the existing criteria that, if technology existed and was in widespread public use that allowed ordinary people to routinely see through walls, then yes, being behind a wall would not give you a reasonable expectation of privacy.
Assuming we ever reach that point, the Supreme Court would either need to come up with a new test of what constitutes a search or we'd need to ban such devices so people could still expect privacy in their own homes.