Ok Faer
So if you watch the observer nowdays you will see low ranked teams bringing two of those guys and putting very high pressure on a good team who is trying to outmaneur and outskill by doing some very "meta" tricks...and sometimes they fail which is kind of silly.
Some of the counters poeple suggest help but can't hold on much longer vs the dual SF combos.
Extinguish quickly deplenishes Ele's energy pool (there is no attunement to protection and Protecting Gaze :P)
Armor and skills VS fire help but the major strenght of the skill is the wide and quick spreading of a burning effect.
So the only sure way is - kicking the hell out of the caster - Divertion, Distraction, pressure on him, KD-ing... the bad thing is those are active counters and work on paper but are not that easy to use on the battlefield, especially vs experianced team.
As an elementalist myself I suggest increasing it's recharge by 4. If not the whole thing I said - it will at least bring some sort of variety in the builds.