The aroma would be better since the crema isn't destroyed by dumping hot water on it. Your average coffee drinker probably won't notice a difference but half the experience is in the mind. Long Black's are extremely common in Australia.
Funnily enough, I once worked at a Starbucks in Canada where our Americanos were actually long blacks just by a quirk in how our line was set up. You'd fill the hot water first before it got to the barista.
No thanks. I don't want the back wall of my bar to look like a snuff film. I'm all for making it clear to consumers that alcohol is a major carcinogen but maybe start with alcohol advertising and education?