I too saw this article in the Guardian and am a retired sw and tm mgr of a fostering & adoption team for a LA with 30 years experience. I agree with you that it is regrettable that the adoption rate has fallen to a new low, but I am not surprised.
The chief exec of Barnardoes has been saying for a long time that care cases should be speeded up and less time spent on trying to keep the child with the birthfamily and I agree with this, but of course the first duty of the sw is to keep families together wherever possible. Judges will not grant Care Ordesr if he/she feels that the birthparents haven't been given every opportunity to learn to keep their children safe.
The sad truth is that if babies are neglected or abused in their earliest days, weeks and months this will have dramatic effects on the way they function through life. There is evidence now that babies can be harmed in utero if there is domestic violence and tension in the mother. The first 3 years are the most important in a child's life and lay down the foundation for their entire life.
Many adoptors think that if they love and care for these children all will be well, and sometimes of course this is the case, but for many many children they have been so seriously damaged in their early life, that they are unable to settle into normal family life. I have seen adoptive families torn apart by the difficulties of adoption, marriages break up and mental health difficulties suffered by one or other of the adoptive parents.
You mention break down rates and the older the child the more likely that the adoption placement will break down. I think you are right that there should be far far more support available, and post adoption support is now a legal duty for LAs. The trouble is that LAs are struggling with 30/40% vacancy rates inthe inner cities, large numbers of sws off sick with stress related illnesses, and now have to spend around 60/70% of their time before a computer screen (thanks to Lord Laming) and child protection is the main priority.
With the cuts that this govnmt are making (well slashing budgets rather than cutting them) the situation can only get worse.