“What's this world coming to?”
You see a commercial for a TV show that looks really dumb. You're disgusted that the network would allow such a dumb show and that people would watch it. You say this to yourself.
What's this world coming to?
This expression means "What is going to happen to the world?" It expresses your disapproval of something. Use it when you notice a negative trend in society.
For example, you can ask "What's this world coming to?" if you hear about:
- horrible news stories
- children behaving much worse than they did when you were younger
- rising prices
- movies that are very sexual, violent, or dumb
"What's this world coming to?" is a rhetorical question, which means that you don't expect anyone to answer it.