We absolutely need a Stranger Things pinball machine! I just finished season 3 and wow, that was the best season yet in my opinion. After 3 seasons I think there's more than enough content to make an incredible pinball machine. Put ZombiYeti on the art, Lyman on code and a Stranger Things pinball machine would print money.
Having licensed content would be key for the game (with actor audio / video) to be done correctly as would a deep ruleset. Stranger Things is essentially a big D&D campaign. The pinball machine would need to feel like a journey based pin (LOTR, Star Wars, Hobbit, etc) with wizard modes for each of the seasons bosses. Just a ton of cool possibilities.
The creator of the show recently said that season 4 may be the last season (sounds like 5 at most). It would be great for season 4 content to appear in the pinball machine. Too many pinball machines based off TV shows feel incomplete in my opinion (GOT and TWD) as they don't feature assets from all seasons. Season 4 will likely be coming out late next year so a Christmas 2020 release date for the pin may be possible.