- Not having to reassemble the massive cast dealing with schedules, negotiations, etc would free up time and allow the shoot to begin sooner.
- Wolverine's massive popularity among fans would ensure a good box office and omitting the other 5 or 6 X-Men would streamline the story and keep the budget down.
- When execs see the possibility of expanding the franchise while keeping the budget and cast concerns to a minimum, they try and do so.
It seems that the latest premise 20th Century Fox is considering for X-Men 2 concerns the Legacy Virus, a man-made disease that is only infectious to mutants, eventually resulting in their deaths. I'm assuming this was a story arc that originally appeared in the comics, as Michael Chabon's proposal (see below) also used the Legacy virus as a major story element. It is only a treatment and could very well be passed over in favor of something else. Of all the rumored story lines, I think the most interesting is the Wolverine Solo pic which focuses on the Logan character and a search for his identity (fitting in perfectly with the ending of the first film). There are several advantages for Fox: