An incremental approach of taking people off particular articles is less drastic and leaves them free to make more helpful edits elsewhere. Those that are particularly attached to their material would have a powerful incentive to retrain themselves, since we don't have time to be their writing tutors. However, if someone gets asked off of a number of articles, then at some point we would need to look at asking them not to edit any more. Incidentally, I would still very much like to see a per-article blocking feature.