This modern era of successful superhero movies started with first Blade movie in 1999. It has been going on for 15 years, with no signs of slowing down.
I would say the Tobey Maguire "Spider-Man" movie in 2002 really kicked it off.
Yeah, I doubt most people knew the Blade was from the comics. Is he even a "superhero" since his origins are in a horror comic? (Tomb of Dracula