It's a great article, thanks for posting.
You mentioned the future of parrot keeping and have got me wondering about that as well.
As per a point that the article brings up, there is no selective pressure that would either bring about or perpetuate intelligence in captivity.
Much of the time the default, and ignorance based, human attitude is that we "save" captive-wildlife from the wild. That is because the wild is (to us) cold and cruel and harsh. But these terms are meaningless because they simply represent our emotions. Or, more to the point, we are placing a conscious demeanor onto the natural world...rather silly. Nature is neither emotional nor does it take a moral stance (good and evil being human constructs). Even longevity, often cited as a benefit to captive life, constitutes a human virtue - a way we place our value system onto another animal. In other words, lifespan itself is simply another evolutionary adaptation bestowing upon the animal enough time, under the conditions, to do its job - which is to pass along its genes. The interesting thing is that within the field of anthropology we can clearly see that human beings were happier at a time when we also happened to have a much shorter life span. The fact is that conditions within the natural habitats of parrots shaped their behavioral as well as physical characteristics, adapting them to their circumstances. Creating the very characteristics (intelligence, sociability, etc.) that we love.
I don't know what the future will bring. But for animals known for their intelligence such as parrots or octopuses, if fully removed from the wild (or if the wild is destroyed) we may never know what they had the potential to become.
It seems that corvids are thriving alongside human beings, and even adapting their behaviors as they live freely among us. Naturalized parrot populations, however, are not doing as well. It is agreed upon by experts that they are struggling, their populations perpetuated in part by escapes.
"Gifts of the Crow" is a great book on the subject matter of avian intelligence. It covers much of what is in the linked article. It's got plenty of science but in a more conversational manner along with many charming anecdotes.