I love CMI's art style, but I still think it's wrongheaded to think it couldn't look absolutely beautiful using 3D... albeit in a total remake kind of capacity. Pixar has shown time and again that you can retain all of the beauty of 2D animation in 3D, provided it's done well. And there's lots of different ways of implementing 3D, too.
If you want an example of a beautiful game with 3D characters over 2D background, look no further than my avatar. It's easy to forget that Broken Age featured 3D wired animated models. So again I stress my point: it's all about how it's done. So personally I'm less concerned with the tech and more with how they use it.
Of course, if they decided to stick with a pure traditional 2D art style of CMI, and do more of a remaster, I'd be equally as happy... provided it was done well.
Basically, whatever route they go: Don't eff it up!