You might get your wish. Range Murata said he'd love to do a third series. After all, the entire region seen in the 2nd series is only in and around the Ukraine. And there are at least 3 more Exile ships up in orbit that did NOT have their populations appear in the 2nd series.
Be sure to read the interlude manga that takes place between both series. Tatiana and Alister make major appearances, and we finally see just how much of a joker Alister can be - she virtually puts on a show, just to hook Tatiana & Claus up.