Probably so. And despite the annoying wokeness, it probably won't be the worst superhero movie ever made.
People keep saying this, and I have no idea what they mean. There's all this talk about things moving in trends like capeshit, fantasy, scifi, etc, which is maybe true with regards to what the most visibly popular trend in film is. But at a certain point, there have been adaptations to film/tv of superhero properties almost as long as there have been film/tv.
There have certainly been more superhero films per year since the MCU started, and you can expect that to decline a bit after Endgame, but that's really it, just a bit. Before Iron Man 1 you had Toby Macguire Spidermens and Jackman/Stewart Xmens (and for better or for worse they are still releasing films that tie into the first one today) before that, you had 90s batman and Blade films.
You've got Nolan bat, which only partly overlaps the MCU on the timeline.
And all of that without mentioning modern DC films.
Meanwhile, it's not like scifi has been missing this whole time, from one-offs like Interstellar, Inception, Arrival, etc to Star Wars and Alien and Terminator (again, for better or for worse). Yeah, there will be less, but I do not forsee some long gap of five or even two years with no superhero films.