Cripes, people, Brawl doesn't need THAT many retro characters. Melee only had two out of 24, and Brawl already has one (Pit) so at MOST it'll only have one other. While that does mean that retro characters do have "a shot", it's "a shot" for like, one to two more slots at best when there are TONS of different retro characters that could be put into it, and that's assuming IC and/or G&W aren't returning, too!
In other words, yes, retro characters have "a shot", but in the overall scheme of things due to the large number of retro characters combined with how there probably aren't going to be THAT many retro slots, it's a LONG shot.
The same goes for WTF characters. Of which there was only ONE in Brawl.
Not that Rudy is a retro character or a WTF character, anyways (being a "WTF" character involves a LOT more than just being obscure. G&W was "WTF" not just because he harkens back from the LUDICROUSLY OLD DAYS BEFORE EVEN MARIO EXISTED, but also because... well, LOOK AT HIM. Stop suggesting WTF characters that aren't really WTF, people!)