Well, that's the beauty of what Marvel is doing. They take obscure characters and turn them to box office gold. Obviously if they keep on making movies or series about popular characters, sooner or later, the audience will have hype fatigue. I believe what Marvel is doing is to tell a story that spans multiple formats. Nevermind that one movie or series flopped, it's their relevance to the whole tale is what matters. Even Sony is riding on the Marvel bandwagon.
Moon Knight may not be everyone's cup of tea, but the presence of the series is an important aspect to the whole phase. I mean, I'm a little let down with The Falcon and Winter Soldier, but I see their value as they put seeds in the show that the producers can sow later. The only thing they need to do is follow through, which Marvel has been very consistent with.