They've already put him in the show in Paris!
Here's the video -
I like him but I don't know if it really works, it seems to slow down the pace of the show because they're so slow compared with the stunt cars. But I bet kids will be entertained enough just seeing the characters.
Why don't put them together? Herbie is the Lightning McQueen of my generation!
In my opinion Lightning McQueen is not a good "fit" for Lights, Motors, Action; as we are "on set" of a live action film and seeing how they create the stunts. Since Lightning is an animated character this messes with the storyline for the existing show.