The point would be that the animated series would at the very least be more open for younger viewers. Now the TV series itself is aimed at teenagers just as the comic was, but if you look at the Avengers, X-Men or any other popular superheroes the key is to get that recognition in as early as possible. There would probably have to be some massaging of the material somewhat, but if Static Shock could have a relatively true to the material, and well received animated adaptation I don't see why the Runaways couldn't at some point. Or even just an appearance in another series.
Not that every comic has to last forever or spawn a massive multi-media franchise in itself, but an animated series might do some good for future longevity. Historically animated adaptations are more fondly remembered than a lot of live-action superhero series.
Rowell claims to have not watched anything of the show, and there hasn't been a lot to suggest otherwise. Likely she decided that Gert coming back was worthwhile, but only if there were consequences. Those being that the others had moved on to an extent, and the already broken up relationship wouldn't have a chance.