Actually, Disney is trying to revive 2-D animation (there's a thread about it around here somewhere). Just like painting didn't go out of style when cameras came out, no art form is ever gone forever. Frankly, I think people are getting a bit sick of all 3-D animation, all the time. Yes, "Toy Story" was cool (oh my gosh, they used computers!) but there's something to be said for classic animation.
I never said 2D animation is a lost artform! If you'll read my post you'll notice I'm studying to be a 2D animator so I would hardly be one to say there's no future for the techniques.
Yes, it's true that Disney have reopened a 2D studio and are working on at least one new film (I've only heard about The Frog Princess, but traditionally Disney have worked on more than one feature at a time).
I'm also with you in hoping that the novelty of 3D animation is wearing off audiences now and that presently there'll be a market for 2D features for cinema release again (western ones that is - I think people don't really assosiate anime with Disney so the popularity of that wasn't affected by the failing fortunes of Western stuff). For one thing I'd love to see big, gorgeous 2D animated films again - for another I rather hope to be employed in this field one day!
I'm just pointing out that any 2D adaptation is pretty unlikely right now, and it's naive to expect the 2D animation industry to build itself back to full strength. Disney tentatively reopening a studio is hardly a full-scale comeback and I don't the industry will ever be half as big as it has been. And even in the 'golden age' of animation, I can't imagine any studio taking on the risk that is HDM. Animated films of any sort are horribly expensive to make. Studios have usually played it very, very safe. HDM is controversial in subject matter and appeals to an older age-range than is Western animation's demographic. Sure, it could happen and I would love to see it, but it's just not likely.
Stay out of Camberwick Green.