That's a good question. What have you heard online?
To find the answer to this, would need more data. It could be social discontent and social unrest would be side to side with the fiat currency collapse. Instead, hopefully it happen in stages. So hard to say. Could most people predict 2017, for the rise of crypto??? Difficult to forecast exact time, but like the weather, there be signs, such as higher adoption of crypto. It's just this past year, that more people know of bitcoin. Futures market just accepted Bitcoin. Litecoin just made Visa Debit deal, coming Feb 26. When people start using it more in global transaction, I think it be close. You don't want this to happen suddenly or it can cause a lot of pain financially. Best it happens in gradual steps. My rough guess is by 6-10 years, your see more people into it - 10 years is a generation in technology years.