A Mandalorian Wars Battlefront-ish game wouldn't work because there wouldn't be any recognizable hero units you could market (Fett, Vader, etc) and the grunts would have the same problem (no Stromtroopers, etc).
An EAW-ish game would have a similar problem in that there wouldn't be any popular vehicles to include (AT-ATs, X-Wings, etc). It would just end up looking like a generic sci-fi RTS rather than a big deal Star Wars game.