A165: I'll disagree with Agita. If your speed allows you to outmaneuver your opponent, this debuff can be good no matter what the level. 1/2 movement, cannot run or charge is not too shabby. Toss in Slow Breath and your opponent is down to 1/4 movement. It depends on the encounter... against ranged attackers, this isn't that big of a deal, but I can cripple a melee opponent.
The -2 to their attacks, and the -4 to dex to lower his AC (for ally's attacks) and Reflex saves (for subsequent breath attacks) doesn't have as much impact at higher levels.
A166: If your campaign allow for Dark Creature, Feral, Half-Minotaur, Mineral Warrior... then no. Draconic Template is rather *meh* IMHO. It's ok, but only mediocre compared to others. YMMV, but I wouldn't consider it without LA buyoff.