I'd much rather that Mega Evolution is accessible to only those Pokémon that have reached a certain BST. Until then, let GF introduce normal evolutions for them. You look at something like Houndoom and it needs a normal evolution.
This is one of the silliest things I have ever heard. Are you one of these people where everything must be OU worthy or super strong or something? Houndoom is REALLY strong ingame. It has no need for an evolution. Maybe stuff like Spinda, Luvdisc or Farfetch'd need evolutions, but stuff which is already pretty strong do not. I like the variation down and up in terms of power. If everything was strong it would make the game really boring.