The chances of a Saga move ever happening are probably slim. Creators Brian K. Vaughn and Fiona Staples have said on a number of occasions that they don't necessarily want it to be adapted to film and it's definitely one of those properties it's hard to imagine working on the big screen. Despite that, Thor: Ragnarok star Tessa Thompson (Valkyrie) is now campaigning for the role of lead hero, Alana.
Before Tweeting the image below to make it clear she's a fan of the Image Comics series, one of her followers suggested that she should take on the role in a live-action setting and the actress replied: "Oh my. I’m very obsessed with Saga. That would be so dreamy." There's no denying that she would be perfect for the role but it's still hard to imagine it ever becoming a reality as things currently stand.
A TV series could work on a network like AMC or HBO but Thompson already stars in Westworld and would more than likely be too busy. Still, after seeing this, you have to hope it happens one day.