I'd say that's a fair assessment - and makes a lot of sense if you're GM. Take an existing product, electrify it - charge a premium to see if it'll work, go from there.
However, I personally feel that shoehorning EV into ICE products isn't the right solution as there is a lot of compromise...design something from the ground up specific to EV's seems to work better. Tesla being a good example. Volt (while a capable product) was filled w/ compromise and sales suffered (note, I own a Volt as well as a Model S).