So, here's my stance on this
I think Slippy Toad is a great character and all that, and he does make me laugh sometimes. I would support him for Super Smash Bros, but at the same time, I could only see him as a clone, so that makes me think he would be skipped over like Chrom was. If anything, I could only see him going as far as an assist trophy.
Do I support Slippy? Yes. Am I really that confident about him? Not really. Do I see him as a pipe dream? No, it's just not the best choice for a fourth STARFOX rep in my eyes. Maybe if Star Fox Wii U really exceeds expectations and Sakurai did five reps for StarFox I could see it as guaranteed, but I guess we'll have to wait and see.