There are big reasons why you haven't seen much innovation in the pinball industry for decades.
Relative to the manufacturer: Innovating is expensive, time-consuming, and risky, and there's no reason to innovate if you're growing your revenue and customer base building traditional machines with no new features. So you'll most likely only see true innovation from a brave startup company.
Relative to the customer: People say they want innovation, but they don't vote with their wallets. On the whole, they continue to buy traditional products and don't force the manufacturers to change. When an innovative idea comes along, they're hesitant to try it because it's unique/different and not what they're used to; so it takes time for true innovations to be accepted.
The current resurgence is largely due to the community getting involved in custom pinball development (due to innovative products that help anybody create pinball machines. ie. 3D Printers, P-ROC control systems, CNC-kits, etc), but only gameplay innovations and better value propositions will sustain the resurgence and truly help pinball achieve sustained growth. That's why I founded Multimorphic, and innovation is part of our mission statement. We're developing a machine to provide new and exciting gameplay features and a significantly improved value proposition to pinball machine owners and operators. In other words: fun new features, ever-growing game library (yes -- physical game kits, in manageable form), and MUCH lower cost per game than everybody else in the industry.
Here's a post with a list of the innovations we've discussed publicly. In 2016 when we start shipping machines and when we and others are selling add-on game kits, you'll see this list grow significantly.
https://pinside.com/pinball/forum/topic/p3-features#post-1528702
If you truly want to see innovation come to this industry, you can walk the walk by supporting our efforts.
- Gerry
http://www.multimorphic.com