They have to be open to it. The real question is how much Marvel wants those IP's back. At first, it was strongly considered 'b-list' characters Marvel had on their hands (in terms of popularity and marketability), but now its pretty obvious they have the strongest lineup.
Why would Marvel want to share revenue with other 'competitors'? The only way i see them wanting to hear any sort of deal would be to negotiate getting their characters back home.
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