Rather than speculate on why the game isn't getting more content, I wanted to think about what could have been.
If there were a Clone Wars themed box, I'm assuming that it would be 100% for the campaign. There's a lot of material to draw on, but not enough to make a Republic or Federation faction stand toe-to-toe with the current Rebel, Imperial, and Scum factions. So what units are in that box?
There are B-1 and B-2 Battle Droids, droidekas, a trade federation tank, plus some Geonosians, and maybe a spider droid or one of those droid speeder bikes. Throw in Count Dooku and General Grevious or Klik-Klak and you've got a solid Core Box. But what else could go in there for the Core Box or expansions?