I certainly think the AC/DC machine has set them up for a few years as it has been a great title and very good seller.
I guess they were never really off the pinball map as they are the only manufacturer regularly churning out machines, but there is no doubt that some of the previous titles were a bit ho-hum in some respects (sticking to a tried and true formula). AC/DC has lifted the game for them and has generated a lot more interest.