I've got the book, and I do see what you mean. Although the art looks far from unappealing in high resolution — it's beautiful — I can't see how it'd gel with the original pixellated character models and such. The lines and everything are just too smooth and it'd look ridiculous.
If they were to tackle something like that, they'd have to redraw the characters and props in a higher resolution, more like CMI. And that's a prospect I've not sure how I feel about.