No way can a prediction like that be made. All it takes is a major disaster south of the border like an earthquake or a revolution to send millions more streaming northward. Until we close the borders and actually enforce the laws there's no guarantee the invasion will ever stop.
this article is deceptive in that the slowing they describe is based on percentages. The raw numbers will continue to increase. For each illegal that settles in, there are numerous friends and relatives that can potentially come to live with him/her. That's why Mexico's foreign relations secretary Santiago Creel is asking for more Mexican visas, even though millions are issued every year.