I would say it depends on how good any alternative solution is and how realistic it is to pass.
Edit: Having read your blog post, I want to say that I'm not necessarily asking for the original definition of DNT to be reused. What I want is for the DNT header to have the same effect as if I had said no to all optional categories of cookies.
The status quo is that we are asked a "yes or manage" question where "manage" means something horribly complicated that no one does. If we redefine DNT to mean "no to everything optional" then it becomes a matter of local law to define what is and isn't optional. This allows for the sort of minimum level of consumer protection that you're asking for.
The law could also require that this DNT header is opt-out. A per-site overridable DT header if you will.
I'm not going to claim that I have thought this through properly. It's just something that I wish Mozilla did some work on.