Fox didn´t "decide" to make Wolverine the leading character out of the blue. He was already hugely popular as an X-Men character, maybe the only one who people who didn´t read the comics recognized. The only one who has kept a solo book non-stop since the 80´s. It would be really crazy to make an X-Men movie with Wolverine not being the leading man.
I think that a Rogue or Storm solo movie in the future is very much impossible, but I´d like to see them again in another X-Men team flick.
That´s what I think too. I wouldn´t care less if Batman wins anything at the box office, if Spidey 3 makes like a billion bucks worldwide...some people are so obsessed with this box office thing, they forget that movies are SO much more than that. I just want Wolverine to be a great movie, I never expected "Lord of the Rings" or whatever numbers for it, that´s just ridiculous...
Some of the greatest movies I´ve seen in my life - and I´m talking here also about French, Italian, Japanese, Spanish, Brazilian, etc, movies - were never a smash at the box office. Still they were (and are) amazing, intelligent, intriguing movies. My only hope is that "Wolverine" will be like that, not break box office records. I´ll leave this to PotC 4, 5, 6, 7, 8...