I'm for this in a general sense. But I feel like it will be a small game mode in itself and more complicated than it sounds. So I'm unsure as to weather the devs will want to dedicate production time to it. They have a lot to do as it is. I saw some people mentioning Titanfall and the retreat mechanic in that. I feel like it would need to be quite different in EC, since TF it much more of arcade shooter.
I think this is an interesting mechanical idea from the perspective of the meta level game. Being able to save some of the resources from a lost battle seems really interesting.
once i think of it, this mechanic would only feel "rewarding" if it was open world. Said ship takes you back to said main fortification. If it just snips out and gg like titanfall im afraid that wouldn't be enough.