The scrolling genre died a long time ago in the arcades, i remember it being completely different as a kid, i mean hell, a place near me which was basically a gym, sport centre, had a Street Fighter 2 Turbo cabinet. Ah the good old days when you had the likes of Metal Slug, Turtles, even the simpsons scrolling beat em up game.
I think the reason there is so few beat em up arcades now is because of consoles (you could argue that the rise in console gaming is the direct cause of arcade decline but there's other factors as well) Long gone are the days of "Winner Stays on"
In 1996 i stayed at a holiday part called New Quay West (ironically it was near NewQuay) in the arcade centre there was a lone Mortal Kombat 2 arcade machine (there was other machines there but i think the only other beat em up was a street fighter 2...the first Street Fighter 2 machine) it constantly drew large queues of kids, who had learn ever fatality move on there, it was a really fun time, plenty of smack talk but none of it ever vicious, they even gave the losing player pointers or taught each other how to do the moves. I wish the days like that would come back again