a Cpt. Marvel movie without focus entirerly on Mar-Vell is an idiotic idea. He IS Marvel, like Pym is Ant-Man and Stark is Iron Man
He's been dead since the 80s. After that, Carol took over his rogues gallery even though Carol was put on the backburner herself due to the Marcus fiasco.
But starting in the late 90s, Kurt Busiek reintroduced her to the Avengers and she remained on the team through Geoff Johns' run. She thankfully only appeared in one issue when Chuck Austen was writing the book. She was integral to the Avengers during the first few Bendis issues, then after they broke up, she got her own series where Brian Reed really grew her character, part of the way through Bendis started writing her again as the co-lead of Mighty Avengers alongside Iron Man.
Once Reed left to write Halo, Carol took only a one-year break, during which, Bendis made her an integral character of the second volume of Mighty Avengers, then Kelly Sue Deconnick began writing her both in a solo title as well as Avengers Assemble.
Point being, Carol's been omnipresent for the past decade and a half without taking a hiatus from publication. This combined with lengthy runs by Busiek, Johns, Reed, Bendis and Deconnick without a constantly shifting writer on board have made her at the very least a B-lister around where Iron Man was before 2008.
This isn't taking into account her late 70s appearances under Chris Claremont, nor her Binary days with the X-Men in the 80s.
There is a TON of source material to draw from along with her appearances in video games and cartoons. I see no reason for Marvel to do an Inhumans movie before Captain Marvel. I'm not hating on Doctor Strange or Black Panther and yes, both of those should be a part of Phase 3 as well along with Hulk, Captain America and Thor sequels but there is nothing wrong with stretching Phase 3 out a little bit longer to give the MCU more room to breathe.
I mean if it's two a year then we still get
2015
Ant-Man
2016
Hulk 2 (May 6)
Doctor Strange (July 8)
2017
Black Panther (May 5)
Captain America 3 (November)
2018
Captain Marvel (July)
Thor 3 (December)
2019
Guardians 2 (May)
Avengers 3 (August)
But if things were brought up to three a year, it's still lengthy, particularly when you consider that Marvel is still able to push out two Summer 2015 films. By mid-2014 there won't be anything filming once you consider that Age of Ultron and Ant-Man will both be wrapped shortly after Cap 2 wraps up.
If the production schedule doesn't slip and nothing becomes a troubled production, then three a year is clearly doable, particularly given that 2016, much like 2015 has two summer releases and nothing for the holidays.
2015
Ant-Man
2016
Hulk 2 (May 6)
Black Panther (July 8)
Doctor Strange (October)
2017
Cap 3 (May 5)
Captain Marvel (August)
Thor 3 (December)
2018
Guardians 2 (May)
Avengers 3 (August)
Unlike what a lot of people have been saying here, I've never been against Black Panther, I just view Inhumans as a property that can be saved for Phase 4. The Inhumans only have ONE villain and that's Maximus as they've never been able to maintain their own series for a significant amount of issues and with the exception of Crystal joining the Avengers, most of their crossovers were with the X-Men and Fantastic Four, both of which are at Fox.
Yes, Carol did leech Traveler from Spider-Man, Yon-Rogg from the first Captain Marvel and Moonstone and MODOK from Captain America. Except Mar-Vell is dead and will probably never come back, Traveler was regarded as one of the worst parts of the Clone Saga, Moonstone lacked any real connection to Captain America and MODOK spent just as much time harassing the Fantastic Four and Iron Man if not more than Cap before settling on fighting Carol.
Oh, and Cru Doomsday Man 100% Ms. Marvel villains and both the X-Men and Guardians of the Galaxy were the ones to leach Deathbird from Carol.
My point is that Carol works far better than the Inhumans for a film as she has more sequel potential, was part of the Avengers far longer than Crystal and she's not a new ensemble like the Inhumans which cuts down on cost.
Now when looking at any of the other properties that Marvel Studios owns, Power Pack will probably be animated like Big Hero Six, Moon Knight, Runaways and Punisher will probably be TV series and Blade and Ghost Rider should come after Doctor Strange (and Kevin Feige agrees) so that means that they won't appear until Phase 4. Black Widow is really the only other possibility for a Phase 3 film. Keep in mind that Cap 2 is almost as much of a Black Widow film as it is a Cap sequel so I'm not 100% certain that BW will get her own film in the near future but she's the only alternative to Carol out there.
X-Men, Silver Surfer, Alpha Flight, Fantastic Four, Starjammers and Deadpool are over at Fox and Sony owns Spider-Man, Black Cat and Silver Sable.
After that it's just spin-offs like War Machine, Hawkeye, She-Hulk and Winter Soldier but Phase 4 will probably be so packed that I can only see one or two of them earning a slot at most. Carol Danvers is one of the few solo heroes that can still be made into a solo film. Marvel would be truly dumb to not take advantage of her.