He doesn't want to re-release a game unless it can be improved dramatically, which is why we get remakes and not re-releases. The anniversary collection is one of the only times that games were actually re-released in their original forms.
I actually don't think DQ8 is going to be touched for quite a while.
except if its portable as he could argue that portability is an dramatic improvement (kinda happened with 3 on the gameboy too right?)