Fans aren't the only ones who have thought about the future of the prematurely cancelled Agent Carter, star Hayley Atwell has her own ideas about what could've been. Most of the MCU has been a series of success stories. Agent Carter, the ABC TV series that spun directly out of Captain America: The First Avenger is a sad and rare exception. Although it was the show most directly tied to movies, with Hayley Atwell reprising her role as Steve Rogers' first love Peggy Carter, the series failed to gain an audience.
The show was cancelled after two short seasons, and fans have yet to really get over the loss. The cancellation isn't made any easier by the fact that the season 2 finale ended on several cliffhangers. The death (or life) of one major character was left in doubt. At the same time, the show also sparked a new romance and chapter in Peggy's life but left it open-ended. It's on that latter and romantic note that Atwell thinks season 3 would've picked up on, if it had existed.
ComicBook reports that Atwell was at ACE Comic Con when she was asked about the beloved series. When pressed to answer where she thinks Agent Carter season 3 would've gone, Atwell responded:
I’d be curious to know what the fans for [Peggy Carter]. Some people have said they want to see her founding S.H.I.E.L.D. You have that aspect of it, she’s able to let go in some ways — of Cap — and move on to Sousa.
Yet Atwell has more musing about Peggy than her romantic and professional futures. Agent Carter was always very political show, despite its period setting. Although the show did tip its toe, very casually, into the issues of the late 40's and early 50's, the feminist tone of the series was universal and timeless. According to Atwell, she woud've like to see the series have gotten more specific and historical. She explained:
[Peggy]’s a great cause and she takes action, so there’s so many things going on socially from the 50s to when she passes, that I think she’d have loved to be a part of, There are so many things so could have been a part of, and probably did do. It could probably fill another season, I’m sure. I hope.
Atwell's comments do seem perfectly in line with the tone and feel of the series. In fact, they'll likely make fans wish a season 3 existed even more. As Atwell's plans for Agent Carter could involve (or require) a serious time jump to get to the meat of the political strife which she mentions. This could be a natural way for the show to work out the last season airing in 2016.
Still some fans might want to take Atwell's last statement as a sign that an Agent Carter revival is coming, that doesn't seem likely. While it's wise to never say never when it comes to MCU projects, there seems to be no plans currently to bring Atwell or Peggy back to live-action. Peggy has also appeared in several MCU movies since The First Avenger, with small roles in Captain America: The Winter Solider, Civil War, Ant-Man and Avengers: Age of Ultron. The MCU hasn't entirely forgotten Peggy and, as Atwell mentions, there are several things her character likely was involved in during her long life.
The problem with an Agent Carter revival isn't lack of ideas. Rather it seems to be a lack of interest. The show had very low ratings for ABC, which resulted in its cancellation. Although, reportedly, it was very well liked and appreciated by the network. The decision to cancel Agent Carter was up to ABC, and it came down to the show not being financially stable for them. The best fans can probably hope for is that Peggy's adventures continue in a comic book or a TV special / Marvel One-Shot.