I would be interested in seeing an arcade that specialised in gaming experiences that are usually cost prohibitive at home. So it could have pins but supplement it with things like the Oculus Rift and the Virtuix Omni treadmill. Also really high quality driving simulators. The Omni treadmill is way too big to fit in most homes and Id definitely pay to play that thing, plus spend some money on pins while waiting or inbetween.
The oculus rift has massive line ups at all gaming related shows it attends so I think that would definitely bring a crowd if setup in a user friendly way at some kind of arcade.