For compatibility's sake, as well as less headache for new users, old DS obviously shouldn't go anywhere.So is this aiming at being able to replace the various ways in which Detectable Spells/Stats is currently implemented?
This.
(Obviously that doesn't preclude people deciding to do clever things in their own mods that go beyond DS. (But I have to say, I've never found the constraints of DS terribly restrictive, so I don't anticipate taking advantage of it personally.)