A lot of good points here. I know the wait for any sort of regular PC version has been very frustrating. I've been following this for about 2 years now. But I'm remaining hopefully optimistic as well. The thing to remember is that Zen (and Farsight) are not huge companies -- and they are very passionate. While they are a business that needs to be profitable, these guys are pinball nuts as well. I bet you they would love to see their game running at max settings on a high-end PC in a cabinet.
And yes, it would be an excellent showpiece for conventions and tradeshows to generate buzz. I remember there was a ton of press around the 3-screen racing cabinets that Turn 10 showed Forza III off on at E3 a few years back. It was something that most people had never seen before and probably didn't even know was possible - just like a virtual pinball cabinet. Same with that Frogger example - you think any mainstream video game site would have posted anything about an iOS Frogger pinball game in the middle of the year's biggest gaming convention otherwise? But I remember seeing several posts about it because of the cabinets.
The passion and dedication of even one person can go a long way. I remember hearing that the 3-screen mode in the original Forza for Xbox 1 was developed by the guy who did the network code because he finished early and had spare time on his hands!
Now most people will not put together their own triple-screen racing rig (I actually did) or build/buy their own pinball cabinet (I have a VirtuaPin coming soon...), but it can definitely further the hobby and help the business.
Heck, I wasn't even into pinball until a couple years ago. I had never really played growing up (I'm 30). There just weren't many around and video games always got my attention first. Then I put together a MAME cabinet with a control panel that had pinball buttons on the side. So I gave Future Pinball a try and really got into it. Then I discovered Pinball FX2, then VP. Now it's a couple years later -- I've been to 2 Chicago Pinball Expos, visited the Las Vegas Pinball Hall of Fame and now ordered a VirtuaPin. And my interest has generated some interest from friends -- even if it is just them buying The Pinball Arcade on PS3.
Bottom line, (virtual) pinball seems to be really gaining in popularity. I hope it continues and everyone can enjoy their favorite titles on whatever device they want, from tablets all the way up to full cabinets. Thank you to everyone involved in the community who is helping push to make these things happen.