Ewkay... Well, Cinderfetch'd and Frostfetch'd have too many letters in their name, and their means of evolution are a bit farfetched (no pun intended... okay, I lied. Yes it is)
Maybe weaker Pokémon like Sableye would need an evo(but of Sableye got an evo, then so would Mawile...<_<;) Plus, now that Electabuzz is getting one, then so will Magmar and Jynx, and maybe Mr. Mime, considering he got a prevo, but it would be completely idiotic for the producers to give a Pokémon both an evo and a prevo in the same generation.
Just remember when suggesting that if a Pokémon gets an evo, then so will its counterparts.