I'm no VIP and don't know anything about Marine specifically, but I think you guys have to realize that it is very unusual for models (especially models in Marine's situation) to just go back to walking shows. Once you're not booked anymore, you're not booked anymore. There's an influx of SO MANY newbies season after season, and if you're not fresh faced and buzzed about, you won't book shit. Some very successful models go back to walking a few select shows (Iris Strubegger) or even full seasons (Caroline Trentini last season, CBN this season), but Marine never reached their level of success to begin with. Some models consistently book shows even though they don't book much print work (Waleska Gorczevski for example, to a certain point also Hanne), but the difference is that they never stopped doing runway, as opposed to Marine. Some models make unexpected comebacks, such as Katlin Aas a few seasons ago. But she's the blandest runway filler, that's the only explanation I can come up with to explain her success. The huge majority of models stops doing runway sooner or later because they aren't booked any more. If they're lucky, they are so great in print that they book A-list work nevertheless (Alisa Ahmann) or can go down the commercial route (Esther Heesch amongst many, many others). Or they end up like Marine and book eds for Harper's Bazaar Netherlands.
(Correct me if I'm wrong, VIPs, just my impression from following fashion for quite some time.)