I've come this conclusion. The LCD screen in place of a blackglass (a la WOZ) just isn't necessary. Sure, it's nice eye candy... but I think Stern has sufficiently proven that what's happening on the play field is what matters most. Stern's recent run of AC/DC, ST, MET, and Mustang are phenomenal games that keep your eyes glued to the action with the ball with sensory experiences boosted by great lighting and great sound. Those games are just plain fun...exactly what pinball should be...and they wouldn't necessarily be better with LCD back glasses.
Comparing these games across the board to JJ's beautiful WOZ (and it IS beautiful), I fail to see how the LCD screen radically improves my game playing pleasure. I know a lot of hobbyists are clamoring for Stern to release a game with an LCD...but, I think think the reality is that it only bumps up cost while offering very little in return. If I were JJ, I'd put my time into the game and save the coin on the LCD.
Now, all that being said, Multimorphic might be on to something...that's an application where a display is becoming majorly interactive in the game play experience.
I'm sure a lot of you will disagree... but, this is where I currently stand.