I honestly doubt that the quest will be the main shaman deck. It‘s interaction with Galakrond is mediocre and that’s generally something you don’t see in T1 decks.

Pure Galakrond however is another story. My impression (Rank 2-1 atm) is that the game starts at turn 1 again. Quest into cable rat has become a pretty slow play. 

Anyways, shaman as a whole remains the deck to beat and as someone said before, most of the cards (except mainly shudderwock) will Stay for 16 more months. Something will be changed for sure