For the better? Sorry but it's way more realistic and beautiful that Chase itself also suffer from the histery, the hum. He's not someone that special do change everything. It would be lame if the author go that way of fixing things, just like what happens in every horror movie like The Nun. Chase didn't have to fix everything, he is too occupied trying to keep alive in this madness.
This is not a history about someone who's involved in mystery and fix everything in the end, that's my only point.
Also Stephen King's overrated. Sorry but this is way more original than his books. And I say that because I read a lot, I never stop reading, it's the only thing I do better. This plot of echo exist for a very long time, I read once that the author actually build some things in 2014. So it wasn't all put whatsoever, he had a plan and thoughts.. A little respect please, you can give your opinion, but say that "I can change this for the better" not very respectful you know. Hope you have a good day, sorry if I say something that made you feel bad. Not my intention