I have been watching an evolving strategy in pinball - the emergence of Pay One Price/Free Play as a business model. Seattle Pinball Museum, Game Preserve Houston, Pinball Co-op in Burlington Vt, Tilt Arcade Bar in Toronto etc. Although it's usually mixed with classic arcade video games, I think it will be interesting to see what effect these ventures have on the biz.
I think offering players a collection of machines as a curated experience to be sampled based on playing enjoyment is a different proposition from the traditional "How long can I play for $xx" one. And one that might bring in a lot of newer players to more difficult machines based on that experience (once it doesn't matter how difficult it may be to learn the machine).