Dair being a meteor or spike would be really janky, because it'd either change how dair works entirely [making it like a Falco dair which would not be useful onstage and still be risky offstage], or it'd be this hitbox that might you might accidentally hit and mess up your kill setup [Hbox vs Armada this happened with his Young Link dair at one point].
I don't think there's any real basis to add a walljump, especially since Toon Link already can. Link isn't very mobile and it'd be somewhat out of character for PM Link at this point in time. It would be nice, although we already have bomb recovery tricks and a tether, so I think it's unlikely.