In the long-term, I think a lot of this will depend on whether or not GM actually decides to make Chevrolet a true global brand or not. With them buying up advertising space on the Manchester United jerseys this season, this leads me to believe that Chevrolet will try to evolve their lineup for global appeal, but that will likely be limited to the Spark/Sonic/Cruze/Malibu at the moment. Still, halo cars like the Camaro and Corvette bring people into the dealers, and if the Mustang is going global, GM really can't afford to not fight in that market.
Its a frustrating time to be a Chevrolet fan. For every new product that makes me excited and want to race down to the dealer to give them a down payment, the lot is saddled with products that are either out of date, or were never ready for prime time despite their release. When their best products are on opposite ends of the spectrum (C7, Tahoe, Sonic and Impala), it makes for a weird shopping environment when they can't push the bread-and-butter vehicles to a regular shopper. Compare it to the Ford dealer down the street, and it is a very dramatic departure when nearly every model is competitive or class-leading, and appeal to a very wide variety of shoppers. GM is definitely on the reactive side of innovation right now, unlike Ford or Chrysler. Those two really don't have much to lose when it comes to pushing out new products, where one is already the class-leader, and the other, looking to break into the segment. Its really unfortunate to see GM floundering with a lot of great ideas and really good products that are completely offset with junk, just trying to push them out the door as fast as they can so that they can make it to the next development cycle.
A Camaro that truly innovates could re-direct a lot of energy at the company, and that'd be absolutely fantastic. But, we're talking about GM, here. A company who's corporate headquarters are inside of a hotel that's styled like something out of Pyongyang, and has design renderings hanging up all over that are from 2002. I can't get too excited. Yet.