Isn't that where the OVA movie came from, a failed 2-parted pilot which turned into the movie
Did you know: Sonic X started production around the Release of the OVA? Originally X was going to be the same world but after a long developement period they made it its own universe.
Technically there still are other mobians:
And there were supposed to be other Mobians in X as well...
And let's not forget the famed "Nazo" character from this as well:
But I get what you're saying (no humans like Chris Thorndyke (only Eggman))