Don't be so narrow-minded. Entei isn't bad as it is now, but it doesn't have enough to offer over Moltres, Arcanine, or Houndoom to be worth a slot. Flare Blitz might very well change that, as with a strong STAB move to compliment that nice base 115 attack of his, you'll think twice about switching in on him.
Added to the fact that he's faster than his fellow Fire types and most of UU in general, Flare Blitz could very well tip the scales in his favor. All we have to do is wait and see.