I actually could see the value in both.

To say "Nobody carries cash anymore" is a far to extreme. My games only accept bills and coins and they do very well so cash is still used by many and it is very easy to get quarters from a change machine or hostess/bartender.

The wifi would not be a bad idea but the one thing I personally would worry about is the hackers that would eventually gain access. Yes, you could say well turn it off but then what would be the point to adding it. It's a good idea, but just don't see this happening and it would raise the cost of an already expensive machine. An added value of wifi would be able to find out what issues the game is having so it would save time to repair before arriving at the location, that I like but not sure if I think I would pass on it if I had the option.