Nothing is being removed/edited with this idea. It would only be "devalued" based on player preference. Generally speaking, I think most people who have purchased the Sevagoth Deluxe skin/bundle did so for the skin itself, more than the Lullaby you get with the Shadow. Seeing as it's freely available on YouTube, it's a nice cherry ontop of the cake.
Also, saying this idea will never happen is incredibly pessimistic of you. If DE only cared about making money, then I'd be somewhat inclined to agree with you, but given how much they've shown to care about community ideas/feedback, to say there is no chance is ridiculous.
It is also possible that this idea gets picked up and applied to Sevagoth Prime several months from now, but I guess we'll see! XD