Not sure how some of you gauge characters prior to headlining a film, but the whole reason this movie exists is because Fox saw he got popular beyond his comic audience subscribing every week. Which does not happen alot. If this was 08, yeah fanboy bubble. His name is pretty obviously mainstream now. It's what happens when comic characters are announced in mainstream movies, marvel puts merch outside comic book shops and lots of youtubers who get 15-20m hits a vid are highlighting him. Those are not small areas for exposure.
Does that mean he's up there with the guys making over 500m film right now? Obviously not. He hasn't had that headlining spotlight on the big screen, and we have no idea where he will land. Regardless, we all know now from movies like Green Lantern, Fant4stic, etc and dips in franchises like X-Men and Spider-Man that when the box office drops it's cause of quality. If this film sucks it won't matter how popular he is.