Nobody knows what the future holds, but I doubt it will happen. I believe that many of the coins that are lost will be from a time when they weren't worth much. As the value of bitcoin increases, people are more likely to take care of them. I think the rate of new coins being lost forever is decreasing.

Another interesting point is shown in the following chart, which clearly illustrates that wallets that were thought to be lost are being reactivated. This raises questions about the estimates that have been made in recent years.