Quoted from o-din:Pinball is going through a retro theme faze right now with no real end in sight
Not just pinball. Nostalgia is selling like gangbusters in EVERY market. Even politics which I won't touch on, but let's leave it at "great again" was no accident.
For something we *can* talk about, look at video gaming. Retro speedrunning is reaching all time popularity highs, most indie games are (and have been) drawing heavily off the 16-bit era art styles and thematic approaches, 3D Platformer games are having a huge resurgence. Heck, the massive PokemonGO phenomenon? Granted that died quickly due to poor software development and bugs.
Everything nostalgic is huge right now. And from some quick research, it's not a millennials thing. Xers and Boomers have had, and are currently having, waves of intense demand for nostalgia products.