I'm not crazy about this for the same reason Bearchaser brings up.
Also, I prefer to leave my ridgeline, (even if it's only larksheaded on,) attached and be able to swap out whoopies if I need to if I need a longer setup, or if one point fails or shows stress. And I can take my ridgeline off completely in seconds if I want to for whatever reason.
It's a clever idea, I just don't really see any advantage besides having a long line with you all the time, which I do anyway. Yes, you can potentially hang between trees that are a little closer together than I can, but I have found no shortage of trees where I camp. YMMV