Jade decks are fun and we need a strong counter to control, especially control decks that never actually try to contest the board with their own minions or sometimes even try to win the game except in fatigue. But as we've seen, control still thrives regardless so it's not like jade makes control extinct and it's not even close to that.
Control warrior and priest are dead though. Reno warlock is a control deck but has a combo finisher which makes the deck viable against jade.