Yes, it was a good move to get rid of that redundant division. Splitting Dodge into 3 divisions, a brand that mind you has less sales than Ford or Chevrolet into smaller divisions prevents the brand from benefiting from the attributes of the rest of the models that would otherwise be a part of the brand. How was Dodge to benefit from having their halo car taken away? Just renaming the Viper with SRT did not reach any new customers. If there was a place for an SRT division it should make models that were not pre-existing (say the ME-412 concept put into production as an example). Taking the Viper and renaming it SRT while having the styling clearly being Dodge on a model that has been in Dodge for 20 years and making the way it could be equipped with plain or luxurious interior is very much Dodge's strategy. How would this establish this as some kind of premium only car when they continue to follow what a Dodge in essence is? What was to be gained by removing the Dodge or Jeep badge and replace SRT for the performance version? It enforces the idea that Dodge and Jeep are not good enough to have the performance model under their own name.
Sergio has done a lot of good things, but he needs to quit making pointless divisions (SRT & Ram) and if he wants to add one, revive Plymouth and give them the plan they are using on Chrysler and get Chrysler back to being a true premium brand.