Interesting article, although I'm not sure what would need to change from a federal level. Permanency planning is supposed to take place within 12 months of a child entering foster care. The states are overburdened and it doesn't happen. Changing the laws probably isn't going to help.
Perhaps it is different in the U.K., but the actual time it takes isn't as bad as it seems in many cases. I would expect that in most situations for infants the foster family ends up being the adoptive family. The length of time from entry into the system to adoption is somewhat moot.