I can kind of understand there are no plans for further "Disney Treasures" releases at this point. The economy is not so great, Blu-ray, streaming and piracy make everything harder and more confusing... lavishly restored classic DVDs with lots of bonus materials are simply not selling so well anymore, I hear. So although I lament it, I can kind of understand that decision from the business point of view.
They could, however, manage to release more titles AT LEAST as part of the "Disney Generations" line. Barebones and "presented as available at this point" they might be, but they're at least, well, available. I can't believe "Mr. Boogedy" and "Bride of Boogedy" haven't had any kind of official release, just to mention a couple of obvious choices.