It has been discussed a lot before. The general consensus is that thunderstorm is just too awesome to give up, since it currently has so many beneficial effects.
But, we don't know yet how arena play will work at level 80, nor do we know how 5v5 dynamics will change with all the new talents.

We might get a glimpse when the new talents are released, but I do expect major buffs/nerfs once the masses reach level 80 and start arena/pvp.