I think he's trying to say that we should not use characters like Blaze, Jet, Vector and the like. Instead, we should replace them with goombas, koopas, and the Koopa Kids.
This isn't a bad idea, actually. Sonic characters that aren't Sonic, Knuckles and Robotnik kind of suck. I've grown to hate Tails over the years because furries often use him in disgusting and perverted pictures (accidentally stumbling upon Encyclopedia Dramatica is not fun). Not to mention he's kind of annoying in the first place.