I think it would be a smart idea from an engineering, manufacturing point of view. The tooling and machining for production can be a major expense for manufactures. If some of those aspects could be re-used it would definitely be a win. Most casual players would never notice that the layout of two machines was the same. Maybe in the old days it would not have gone over but I think it could today. Maybe even more than two machines sharing a design could work. From a resource point of view this would be beneficial. Of course, the overall success would depend upon the themes, the marketing and other factors as with any pin.
I would like to see an adult themed, or A rated, pinball machine, an XXX rated machine not so much. (Having said that, I’m probably destine to end up with a sexy girl or a big dick…….pinball machine that is ) I think that the difference is that adult material can be subtle, suggestive, naughty and nuanced while XXX is often foul and nasty.
Still though, I would like to have a Zingy Bingy machine! Then again I'm a big Python fan. I have never played it but it looks kind of silly, fun and naughty. A little along the lines of the old Benny Hill show, which was a mixture of slapstick comedy and burlesque.
Adult themes I would like to see and would not mind if there were shared layouts with family friendly games:
Vargas Girls
Clockwork Orange
Excalibur
SinCity
Re-Animator
Suicide Girls
Heavy Metal
How about a 50 Shades of Grey machine! just imagine the toy possibilities!