^ But the problem is this...
Everyone, even my 3 year old nephew and my 97 year old Grandmother, know who Batman is, just like they know who Superman and Spiderman are.
But most people have no clue who Venom is.
So without Venom first being introduced in one or two Amazing Spider-Man movies, Venom won't work. Also the origin story of Venom is so integrated with Spider-Man, not showing that first would be an injustice to the character. Flashbacks just wouldn't cut it.
I like the idea of Venom leaving the city, after he and Spider-Man deal with the whole Carnage thing, but it's not a major thing. If his story is in the city, great, or if he goes off on his own away from the city, again great. It's what they do with the character of Brock and Venom, and who the villain would be, that would make or break this concept.
So here is the real question...
If they did it right and first introduced Brock, the symbiot, and Venom in an Amazing Spider-Man film or films, and then even used the Maximum Carnage story as a Spider-Man film that would feature Venom as an anti-hero, setting him up for his own film, who would be the best villain for Brock/Venom?
It would have to be someone that is as big of a threat as Carnage. And it would need to be different than Venom/Carnage, meaning not another symbiote villain. It could be a team of villains. But I just can't think of a specific Venom villain that is different enough from Venom/Carnage.
Any ideas?