Well Sony and Fox aren't bombing their movies. Raimi's Spider-Mans and Fox's X-Men movies were all hits (some relatively). So they won't let them go easily. A mutual deal for cameos is more realistic right now. After Avengers, Marvel holds the cards. They would be doing Sony or Fox a favor by adding their marquee characters. Much less to gain having Nick Fury appear in Spider-Man or The Wolverine.
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