Basically, thy should keep everything that has a really uniquely identifiable technique that celebs should aim to get right, and ditch the rest.
I reckon that qualifies the Charleston to stay, as getting the feet right is such a noticeable and important element, ditto the AT where there are clear moves that should be incorporated and performed properly.
But it qualifies out the salsa, as none of the pros seem to know what the identifiable element should be.
What I'd like to see is something along the lines of DOI, where they have a 'required element' that could account for a certain portion of the marks, and the rest awarded for artistic merit, which at least would make it fairer on those that graft to get the steps right.