I would too, but I don't think it is going to happen. Now that they have opened Pandora's Box in 4E of non-traditional healing, I think that only a compromise will be possible of getting most people on board. The compromise I proposed here will probably not be it, but 4E is so far from traditional healing that I don't see how the original type healing will live in our post-4E world and pull in many of those players.
Granted, they could pull in some elements (like healing 25%), but self healing is tough.
At the end of the day, whatever the merits or cons, this does add an extra something where I cant help but feel we just dont need an extra something. Is HP the greatest model for representing damage? No. But it has never really needed to be. Its just an easy abstract system. What you are proposing is another layer on that abstraction, but I just dont see enough value in it.
Sorry, for my table...pass
I would like to see something simpler - basically once a character runs out of hit points, they start taking damage to their Constitution score. When it hits 0, they're unconscious, and they can go to -Con before really dying.
Hit points could be healed/restoring however (be it cure spells or whatever the DM wants), but Con would come back slowly.
So sort of like wound/vitality points, but streamlined a little, and no bypassing hit/vitality points (which is too much bookkeeping.)