Expert forecast that house prices may fall 30% in the next two years. Do they mean that they will fall, they should fall, or maybe that they might fall?

I also wonder if these are the same experts that only nine month ago, when I moved to London, tried to talk me out of renting, claiming that: “house prices are sure to rise for at least eighteen months.”

We are lucky to live in a society in which we can express nearly any piece of nonsense that crosses our mind. I just wonder how much do you pay an expert to express his nonsense? Because the they nonsense they express seems no better than mine. Unfairly, I do not get paid for them.