Out-of-world, the Echo has been primarily a contrived psychic power acting as a storytelling device and convenience generator. In-world, it originally spurred us to find our own answers and trust no one (which, looking back, was a good idea) and later it got pretty deeply entwined with a lot of topics we're (ostensibly) leaving behind.
(And even the "universal translator" aspect is blunted by the decision to establish the Common Tongue, whatever name you want to call it, as a descendant of the Ancient world to justify Vrandtic being similar enough to Eorzean for the story to function.)
I think a big factor is, "What do people think should be done about the Echo?" - whereby "people" are (out-of-world) "the writers" and (in-world) "the characters".
Consider:
The "jailbreaking of the soul" (for lack of a better term) grants so much power to those gifted with it (recall: the potential for an aetherial wellspring beyond conventional measure; the potential to transcend the flesh and death itself) that I suspect many in-world fear knowledge of it - and how to awaken it - getting out at all, and would prefer it be forgotten along with those who spurred its awakening around the Calamities for 12,000 years. But also I doubt the writers will cease relying on its storytelling devices entirely at least as far as the WoL is concerned.
There's a cost-benefit consideration for continuing to prominently feature the Echo, and one for choosing to let it mostly fade from relevance, too, depending on the story SE wants to tell.
Considering the "jailbreaking of the soul" doesn't seem able to grant powers not associated with sensitivity to aether, especially spiritual aether and "souls", I think some of the possibilities are limited. To pull an ancient joke out of my knapsack, it's not like getting sprayed with toxic waste in a comic book; it's not a grab-bag of superpowers; no one randomly gets the ability to shapeshift into a lime. Hells, even futuresight seemed to really push the envelope. The way I looked at the Echo for years, early on, it seemed manifest differently for everyone because everyone is different, not because it was inherently had infinite, random potential. (Though, maybe, by now, internally, all bets are off. We did, in fact, get canon Echo futuresight, in the end.)
The way I had interpreted the story at the time, Krile's manifestation of the Echo was the natural result of her specific soul, body, mind, memories, etc. being subjected to that awakening, so of course it was deeply unstable when those "settings" were wholesale copy/pasted onto Fordola.
For that reason, I suspect we'd have a harder time "altering" it than we would finding ways for it to simply manifest differently, and for people who have it to develop the ability to use it in differently.
So, with all that in mind...
In my opinion, we're likely to get better results considering the uniqueness of individuals than trying to make the power itself fresher and cooler for its own sake.
I'd be down to explore what became of those who accepted Hydaelyn's guidance and now have nothing to follow. I'd be down to explore what became of those who awoke to the Echo but never even came to understand what it is (not often considered since 1.x). I'd be down to revisit the idea that some people might abuse it, or worse, that society might persecute those who have it.
I can only think of one specific power off the top of my head that I'd love to see explored regardless of which individual got it: You know how the Warrior of Light is not individual Azem-the-Ancient, but is suggested to share many qualities with them by being another person built on the same soul? And how the shade of Hythlodaeus could see Ardbert and the Warrior of Light shared such a core? Imagine if someone could resonate with that part of the souls of others. To intuitively know the character and traits others are most likely to incline towards, even if they've lived a life that made it more likely for something else to manifest. You could really get through to people like that...which, depending on your intentions...