What is the world coming to?
Definition 1 of 1
Pro Tip 1/3Emotional Tone
Used to express worry, disbelief, or disapproval over negative changes or surprising behaviors. 
Drivers keep texting while driving. What is the world coming to?
Pro Tip 2/3Exaggeration
Often used hyperbolically to stress one's point rather than to pose a real question about the world's future. 
He spent all that money on virtual clothes? What is the world coming to?
Pro Tip 3/3Rhetorical Question
No concrete answer is expected; it's used to express consternation or disbelief. 
Politicians are ignoring the issue again. What is the world coming to?