There's another thing which I've missed in the discussion. If you want spins in the basic syllabus, you have to have the infrastructure, both physically and rules-wise, for it as well. That means that schools need to have aircraft that are suitable for spinning, instructors need to be able to teach them, but most importantly you need to teach the students spins to a certain standard, so that they can practice them on their own, and demonstrate them on the skills test. Just like PFLs, stalls and steep turns.
Students going off to practice spins on their own, on one of their flights after first solo? I don't think so.
What I do like is the suggestion that an instructor takes a student out in an aerobatics-capable plane, somewhere during his/her PPL lessons, and demonstrates spin entry and recovery. Not with the aim of making the student a fully trained aerobatics pilot, but just to reinforce the point why spin avoidance is so crucial.
The problem is, as the PPL syllabus goes, this is totally unenforceable. Because at the end of such a sortie there's nothing that the student can demonstrate on his skills test. It would be no more than a logbook entry.