XII needs an HD remake way more than X did. I'd be shocked if they didn't do one as it's exactly the sort of thing that's good to tide people over between main franchise entries. The only question on my mind would be: before XV or after?
No game is cheap to make. Remasters are not cheap to make. But they are a heck of a lot cheaper to make than a full new product, so it's very attractive from their point of view financially. I guess we have to wait until they've remastered X another half dozen times though :]