I'll preface this by saying I work in the comic industry, as both a licensee of Marvel and DC, and others. I've also spent a lifetime in the hobby, and am friends with some of the biggest rare comic dealers in the hobby.
Here's my take: the comic collecting hobby is in dire straits--not as bad as cards or stamps, but still completely screwed. There's a perfect storm of demographics, excessive reprints and digital access, and changing priorities. It used to be if you were a fan, you had to buy back issues to read and enjoy the material and were, de facto, a collector. Now, fans can access the material and the characters through dozens of outlets: black and white reprints, color trade paperback reprints, hardcover reprints, "omnibus" editions, online access, etc. Comics have returned to what they were originally: a form of entertainment, and fewer and fewer people care about condition or value. The best of the best is booming, but even that market is limited to a few hundred high-end collectors who are constantly outbidding each for the opportunity to re-press a book in search of a higher grade, defacing pedigree copies for pure speculation. What used to be considered high-grade even 5 yrs ago is no longer desirable, mid-grade keys often dont' bring what they did, and mid-grade Golden Age DC's from the 1940's are often considered a horrible investment. What I've bought at dramatically discounted prices in the last 3 or 4 years is shocking and I never would have believed it possible 10 years ago.
As for parallels to pins, there are both differences and similarities. Pins are inherently a form of entertainment and much less easily reproduced or accessible in different forms. And, those forms, such as digital ones, can only help the hobby because it is so far gone already. I can't tell you how many people I know, including kids, would have no idea what pinball is without digital access. No doubt it has brought people into the fold.
As a hobby and a market, however, there will definitely be parallels. MM is the perfect example. And, we will see what the constant influx of new games does. I'm sure lots of people will sell older machines to support their NIB fix.
My take for both hobbies is the same---buy what you like, and have no expectation of a ROI. It's just entertainment to be enjoyed by you, your family, and your friends.