That wasn't flippant. Comics were already pushing $2 an issue by the time I noticed them. TV, movies, and Netflix are my only exposure to his creations.
The cameo is something just about everyone knows about and enjoys. People who couldn't afford comics growing up and couldn't get into them later know it. It's iconic. That's great.
I agree here. I am not a fan of comic books nor superhero films. My wife loves them though so we have seen most Marvel movies and it id probably where I know Stan Lee from.
Though IIRC he appeared in "the big bang theory" as well.
Of course - his legacy are the characters and stories and not just the cameos :)