I'm sure there are plenty of vintage games that don't include video.
I have jeans older than video games.
We have a museum of vintage coin operated amusements here that ranges from about 1910 to 1960.
Space is VERY expensive in san Francisco, but this place operates on 25 cent pieces (1/4 of a US dollar), and has been doing well for years.
There are a few newer things included up through the 1980s, like air hockey, etc, and old nickelodeons and musical devices.
It's quite entertaining.
As for maintenance, Dreamland will need a battalion of volunteers, virtually employees, but doing what their skill set or interests allow to benefit the place. For example, I'm a self taught jukebox repairman. I could work on vintage electomechanical devices. I can also push a broom, work concessions, or remove trash.
Again, I hear a lot of people saying they want to see this or that, but not a lot of people stepping up to commit to actually do anything.
I'm sure closer to opening, there'll be more interest.