When a person who constantly makes the same prediction does it again, there's really nothing special about it. If it was some prominent economist who actually makes in-depth analysis and is not known to have biases or ulterior motives, then it would be something that you would want to pay attention to.
Sooner or later we'll have a global economic crisis again, but this doesn't mean that those who warned about it were right - after all, if you make the same prediction over and over, you will get right eventually, but you will also be wrong most of the time. If they can't predict a close enough timing, such predictions are worthless.
We all know that the world economy will sooner or later experience another crisis, so Kiyosaki's prediction is nothing new, he's just trying to be the fastest in conveying news about this. The best preparation for facing an economic crisis that may occur in the future is to prepare long-term savings assets..