Chester left such a legacy, that even if they get a new singer with a similair vocal range, it will be hard to get fans even satisfied. I am not saying people wouldn't give that person a chance, but it will be a big void to fill. And would that person be up for it. New material will always be a backburner thing in favor of the classics for the crowds at concerts. It will be an interesting task to accomplish, and it will be interesting to see how long they would be able to hold on that way. I feel with a new singer involved, even if the band and we as fans give that person the warmest welcome, I know LP has proved that their sound has no limits, and that they just do whatever they like and they are not afraid to change their creative process, but on the other side, I can imagine that entering such a solid group of people, who pretty much will grieving in different ways, even if some time has passed, could be hard for someone who understands the legacy, but is pretty much a bystander in it all.
There is literally no good answer to give on what we want, what we need or what we could see in the future, since I feel it will be something that the band also has to figure out, even if they already made a descision, since you only know if something like that works, when you do it. I will support their descision, even if they call it a day. But currently I can't imagine anyone else than Chester singing In The End, Burn It Down or The Catalyst on stage with the band