GM is offering too many cars to close to each other. IMO they should offer the Sonic on many different platforms. A 2 door commuter. 4 door hatch and sedan. Perhaps a wagon. Then offer different drivetrains.
GM please, please start offering the diesels you sell elsewhere. A Sonic 1.4 turbo diesel in a wagon would get me interested pretty quick for what they should be able to price one at.