The Echo has been here for a long time and was never problematic, even being effective in neutral cards. Who says Fran was more than a meme a few months ago would be denying the reality of the game at that time, all ST was in poor performance.
Specifically ST...currently what gives strength to the two main decks is to be able to skip the "play only one card per turn" rule.
Brokylon Waters are 2 engines and the opponent can answer only to one, the same with Novigardian justice.
The newest is Figgiz Merluzzo that not only leaves 3 bodies, the strongest is a Taunt and cancels the possibility of eliminating the others(some exceptions like Treason)that will be converted into engines the next turn.
And of course, Portal.
It is not a matter of Echo or the Busted dorf, it is a matter of how many you can put on the board each turn.
Here(attached img) I used the Call of the forest in a berserker simply to show how you can quietly not use the ability in something of double invocation.
Additionally notice that my opponent used Damien and Stefan without restrictions.
Since the restriction to decks without units and the new updates the game has been based more on generating points than on denying them, the problem is that there are people who don't want to understand it and keep trying to work wonders with a bronze lock that is completely outdated.
I think we can expect new buffs or some powercreep in other archetypes, I doubt that some other Sihil nerf style , or in that I hope so.