The small volume limit is 5,000 or less per calendar year. It isn't automatic. A manufacturer has to apply to be covered on an alternative standard. Over 5,000 and the entire line would have to meet CAFE averages, and since the IG would be far below that standard, they'd pay thousands in penalties for every one sold.
Until they get a hydrogen and/or electric model, sales in the U.S. will be limited, which makes the dealer expansion rollout difficult. So I don't expect expanded service centers any time soon.