I think the best option would be if Stern could include an optional daughter board attachment that would contain the hardware and software to get a game online. That way it's there for the people who want it, and operators can move it into the machines they think it would be best on (and use their experience to determine if they should buy more modules)
Lots of potentially helpful features for operators.
It's also a hobby with deep pockets. I can see peer pressure amongst home owners to get their fellow owners to install them on games to play online.