I think using in hushed whispers Is deliberately misinterpreting what happened. As others have said, all the Inquisitor does is prevent it from happening. And by "it" I mean a completely irredeemable world that I think we all agree is not worth saving. It's a world where a mad man has taken power, has control of a huge demon army, and everyone the inquisitor knows agrees it has to be fixed. If the time line is linear and changing the past changes the future, literally nobody that is "good" would argue about doing it. The future people also would not know, feel or experience the past changing, they would just be. If it is not linear, then the inquisitor doesn't save that world at all and it continues for someone else to try and save.
Now compare that to solas' plan which will literally involve the destruction of the world and the deaths and suffering of many, or all, people. Given that the inquisition wants to stop it, it's clearly not agreed upon that this world isn't worth living or remaining in as in the future world above. It is literally one man, and potentially a few elven agents, who want to replace this world with another.
The only thing comparable between the two scenarios is that the inquisitor and Solas both want to save a past world. Their methods, means and circumstances do not match at all though.
Solas makes one point clear: what the "elves" were before he created the Veil was nothing like the elves today. They were immortal. They had magic on a scale we can't understand. Spirits were potentially more like Cole - they weren't possibly so easily twisted into demons. All of this was wiped away.
What do the ancient elves think about this world?
When we say "everyone" agrees that this world has to end, we're looking at it from the POV of the people who lived in the old one - who were FROM it. But we should be asking the POV of the insane gibbering demons and red lyrium monsters. That's what Solas sees everyone who lives now as - that's why Cole says that to Solas that we're not "real".
That's the point of the analogy - to see the world from Solas' twisted perspective. That's why he's even a little conflicted - because he's realised by Trespasser that the current Thedas has real and living people in it. He just cant let go of his old world.