What too broad means
Assume that the internet fails (semi-permanent or otherwise). What would happen?
You could write an answer talking about:
- How multi-national businesses would re-shape their internal communications networks after cloud based e-mail and Slack, et al., go away.
- How people would react to not being able to post on or check Facebook, Instagram, et al.
- How credit card companies and banks would process transactions without the internet.
- How local television and print news would ramp up production to deal with the removal of competition of internet news sites.
- How people who didn't have cable would deal with no longer being able to watch movies and TV shows via Netflix, Hulu, et al.
- How local businesses would respond to the surge in demand after Amazon purchases become impossible.
Each of those answers could be 1000 characters long and extremely well written. Which one would be correct? There is no way to determine what the correct answer is; in fact, all of them could be correct.
Therefore, the question is too broad.
Why that question was closed
That question was closed almost exactly two years after it was written. Why so long?
The pressures and attitude of the younger site were different than they were for the more mature site. A younger Worldbuilding was somewhat more focused on becoming and remaining a viable website. The site launched September 2014 out of closed Beta (our first question!), and graduated from a Beta to an open site November 2015.
At the time that question was posted, the site needed more participation to graduate from Beta. Here, for example, are the statistics for the Conlang.SE, which is currently in Beta. So at the time, questions that got lots of views and votes and reputation were a good thing.
Now, we are a stable site, we have graduated, and we have an awesome girl-and-robot logo. The focus now is on long-term sustainability, which means developing a philosophy that will make this site a unique and valuable Internet resource. Our long term strategy is to be a site for good and possibly technical answers to narrow questions. We explicitly reject fishing for ideas, story generation and discussion questions. The question you linked falls into one or more of those categories. Therefore, to show that we, as a site, are consistent with our rules for new questions, it is best to go back and close old questions that are too broad.