If we have a superior intelligence replace us, we'd prefer that it not be a cluster of Daleks. If future intelligences didn't experience happiness or whatever we find valuable, then the future of the universe could be quite sub-optimal according to many philosophical stances.
The danger isn't that humans will be replaced, it's that we'll be replaced by a paperclip maximizer
The danger isn't that humans will be replaced, it's that we'll be replaced by a paperclip maximizer