I guess you're hinting at the idea of volumetric displays.
I agree, if open-air volumetric displays ever become realistic, they'll have all kinds of applications in pinball. It'll be like Pinball 2000, only good.
...however, the state of the art for open-air volumetric displays is pretty primitive so far. I think I've only ever seen one that could actually project in mid-air in an arbitrary location like in Star Wars. Sadly, it worked by turning the air into plasma, so I wouldn't exactly describe it as "safe". (It was also super loud. It sounded like an electrical arc.)
(Link : http://www.burton-jp.com/en/product.htm The guy in that photo is not wearing 3d glasses. He's wearing safety glasses because the display puts out too much UV.)