Not really - "arguing over where to draw the line" would be a discussion about how a hypothetical new law should treat model weights; however, assertions about

Not really - "arguing over where to draw the line" would be a discussion about how a hypothetical new law should treat model weights; however, assertions about whether they are a derivative work (or even "work" as such, in the sense of copyright law - noncreative transformations aren't copyrightable works, no matter how much "sweat of brow" or money they took) is a discussion about where the old copyright laws have drawn the line, and the "should's" don't matter there, it's about how the courts will interpret the precedent, and at the moment they haven't said that they are derived works, and while they could declare that, there are all kinds of arguments why they also might declare the opposite.