An interesting fact is that while D&D5e is perhaps the most successful edition of D&D ever, it hasn't brought popularity to a long tail of secondary RPG systems in its wake. Leaving Hero aside, there has been NO superhero game in the last decade which has capitalised on the popularity of superhero movies. (The Marvel RPG of a few years ago was not all that successful).
I find that quite remarkable - in a world where comic book movies and characters are mainstream, and where I can buy Dungeons and Dragons again in toystores in my mid-size town for the first time since the 80s, I can't reach out to the shelf next to D&D and find any superhero RPG. Since that is the case, it's hard to argue it's an anomaly the Hero isn't being played in force these days. Even Mutants and Masterminds has had its day - it was much more popular 10 years ago. Weird, but there it is.