yeah that's why it took 2 decades to get another superman film after the last 2 bombed hard as fuck.
you contradict your own argument right there.
When a genre is proven to be fertile ground for box office success you get rival studios pumping out 2-3 per year like we've seen in the 2008-2018 decade not decade+ long droughts between films.
Blade is the first successful Marvel film, period. It opened the flood gates for everything else and convinced studios to start buying up Marvel IPs. The only other Marvel character to release in the modern era on the big screen was Howard the fucking duck. Everything else prior to the modern era, throughout the astr0 boomer generation, was low budget made for TV garbage that didn't make anyone any fucking money.
Yes DC had some success with their far more well known characters, Superman in the 70s and batman in the late 80s/early 90s but both of those franchises had shit the bed completely and DC didn't jump back into the ring until decade or so later after the slew of successful marvel films, namely X-men, Fantastic Four, and Spider-man.