This may seem counter-intuitive, but I also believe the internet has enabled the resurgence somewhat. For me personally, when I stumbled across the IPDB about 10 years ago and saw pictures of the games I played back in the 70's and 80's - I was flooded with sentimental memories. It was like I could almost smell the arcade again, and was the spark that ignited my interest in pinball again.
Then, I searched some more and found a local distributor (www.joystix.com) ...purchased my 1st game, and I was 100% hooked. Part of the fun of this hobby for me is repairing/fixing/restoring older games, and the ability to find parts and technical help is critical. I've heard horror stories about how it was before the internet.
So yes - I agree 100% that a large part of the pinball appeal is it's non-digital nature - but have to give some credit to the digital age for it's resurgence as well.