Arcades in of themselves from my experience are dead, at least in Southern California. They tend to only exist as side-attractions in bowling alleys or theme parks... and even then, they're shrinking. Hell, even Disneyland ditched all the ones they used to have! It was the only place I ever played the 1993 SW arcade machine :/

However, closer answering your question, it depends on the size of them. Bowling alleys likely have all new machines with an obligatory Pac-Man / Galaga hiding in the corner, but if you're at a theme park you can find a row or two of old machines. I've even found a Super Mario Bros. VS machine not too far from where I live! My first world problems sense tingled enormously when it went from 25 to 50 cents a game.

Also, fighting game-exclusive arcades are still around here. That's probably due to the somewhat active tournament circuit though.