The Judge line - “It is plain you committed indecent acts as covered by the regulations; you caused embarassment to the lady, and gave her an unsettling recollection.” can easily apply to downblouse or breasts pics too.

Don't worry too much. The photographers wouldn't stop snapping because of that rule and every self respecting Japanese women must have some candid pics (upskirt/downblouse/breasts/panty) shots of themselves on the internet. It's a two way thing.

Just like those "no pics" signs usually means nothing nowadays.

You know... you can't just kill something that's deeply rooted in one culture by ruling a dubious law.