I don't feel that earthquake is so strong. It's rare for aggressive deck to play any. Yes, that card can give you a win by itself, but it's dead card against other aggressive deck and even against objective deck it can be countered by other earthquake or other pushes. It's just card that in some situation is best card in game, when in other it do near to nothing, thats why its waste of slot, when you have that many great ploys and you can't have them all. In my local meta only objective decks play earthquake. I will not play a card that is great in 20% situations and in 80% is worst card in my deck. That card will be good for aggressive decks only when objective decks will be most common decks and it will be strongest strategy.
Look at AdeptiCon 2018 Grand Clash (22 march 2018). Decks from TOP 10 that include Earthquake:
Orruks - 3rd place - aggresive deck
Steelheart's - 4th place - objective deck
Steelheart's - 5th place - objective deck
Steelheart's - 8th place - aggressive deck
Sepulchral Guard - 9th place - objective deck
And tournament won Orruks with aggressive deck and second was aggressive Khorne Berserkers (with two Hold Objective: 1 and 4, but other cards were aggro focused). Both without Earthquake.
Like i wrote above, Earthquake is bad card for aggressive deck. It would be great sideboard card, but we don't have sideboards in shadespire.
New earthquake looks better, cuz you can get something more from it then from Earthquake in most situation (you can increase distance beetwen fighters and things like that). We will see, but i would not panic yet...
Another info: in TOP 10 there were 6 aggressive decks and 4 objective decks. So among 6 aggressive decks, only 2 of them played earthquake. I would not say that this card is end for objective decks (mostly cuz aggro decks don't play it)