I honestly think the Charger would have been gone by now if Dodge didn't add those trims in 2014-15. What's happening with the Chrysler 300 now is basically what would have had happen to the Charger if not worse.Charger sales have been relatively flat since its introduction. In the US, the Charger has been around 90K sales per year.....some higher and some years lower, but it has been steady. The introduction of Hellcats has not increased sales.
One might argue it prevented a decrease, but Hellcats and Demons only account for a handful of sales in comparison to Pentastar and Hemi Chargers.