I just talked to a friend that works for a supplier that supplies a remote keyless entry system for a couple Chrysler cars. Here's the thing, the RKE (remote keyless entry) systems are practically universal. I mean that the general concept is exactly the same, just minor differences in electronics and such. Essentially it would be trivial for GM to change over to these keys.

The problem is that most people in this country don't like the switchblade keys. GM is NOT going to make a change, albeit small, like this unless its profitable to them. They wouldn't even have to change the hardware in the car, just the key
they'd simply have to tell the supplier to make keys that are cut the same as our keys and work with the RKE modules in the cars.

Put it to you this way, GM is not going to make a change unless they absolutely have to. The best you can do is talk to anyone in GM that you know that may be high up enough to get a word in edgewise. If enough people complain about it, GM may offer an option for it, perhaps even an option that you can get on a Sol that you've already purchased. But given that the Sol is made here, and the fact that most Americans like the current style of key, GM will probably NOT put switchblade keys in the Sol anytime soon. However, it may be possible to get them to offer and aftermarket option through them to have a key made and coded to your car. If they do that, I can imagine that the price would be way up there.