Part of me desperately wants to agree with that, but then I remember that the world probably looked a pretty decent place in 1913 and look how downright awful and risky the next ~75 years turned out to be.
There is no fundamental law of civilization that guarantees that things will only get better. Having said that, I think that on balance things will keep getting better - but only because a lot of people fight for those improvements based upon observations of where our societies are going wrong and putting up a fight to bring them back on course.