She's been a member of one of the most popular super teams in comic book history since 1975. How much marketing do you think a 40 year old character needs? More than a NEW Ms. Marvel or Silk or a female Thor? Like Kip stated,she's a team character not popular enough to carry a solo act. Wolverine is/was the Michael Jackson of the team, Storm is more like Tito or Jackie.
People needed to be made aware that her book was around. A lot of her fans left the comicbook hobby, but would come back if they knew about this. I was one of the fans who left and so did plenty of other fans of hers I know/knew on my personal IM buddy lists (I haven't chatted with them in ages, though). Thorette got publicity on "The View" and the new Ms. Marvel's solo title also got recognition in the news to help promote it. Fact of the matter is you can't credibly say Storm can't carry her on title given the stories that were told in the book this year and the bad artwork.
While I was entertained by Pak's stories this year, I am a die-hard Storm fan who will support a solo book for the character no matter what. If the stories are bad, I would still support the title anyway hoping that at some point things will turn around and the stories will get more inspired. Most fans who would try the book out are not gonna be as loyal as I am, therefore, it is imperative that the book start out with a bang its first year. Pak should have told big, electrifying stories introducing exciting new villains for Storm that would captivate readers as well as interesting new friends for her to interact with. He could have also mixed in other popular villains like Hela (who has a grudge against Ororo that she has never tried to settle), Blackheart (who would try and corrupt and steal Storm's soul given the kind of mission Ororo took upon herself), and personal enemies of Storm from the X-Men like Candra and Bogan who have not been greatly underused. She could have also interacted with friends outside of her X-pals in this book as well to pull in additional readership.
Also, Storm is much more than Tito to Logan's Michael Jackson. Each character can run their own show separate from the other. As a matter of fact, for many years, it was Logan's Tito to Storm's Michael Jackson in the X-Men books. I don't know why Storm didn't get a solo title long ago. Recently, she's been watered down and new readers coming in don't know how awesome she really is while her fans have been waiting for a long time now for Storm to be awesome again. Marvel needs to make that a reality. For her first year, she needed to take on some big-named foes with scary powers, both old and newly created ones for her book, kicked big butt and taken names. Say what you will, but this did not happen this year and that is a large part of the problem, though not the only mistake Marvel made with this project.