I too have just the one and when I do get more, they will be a breeding pair.This is a very interesting article and while I do agree with most of the things it says, there are others that simply don't make sense for us apartment city type people.
I agree that if you can provide a safe environment for your bird, then it is best not to have their wings clipped. It's very good for a birds mental well being to be able to fly. I noticed, as Tink's flight feathers came in, that she became more confident and a lot more fun to be around.
As for an aviary... I live in a small one bedroom with a really open floor plan and have birdie-proofed it and have so many play gyms, climbing ropes, perches and swings all over the place, that my apartment has become one big bird habitat anyway... I have more birdie furniture than I do actual furniture... My Grandma laughs at me...
The big problem I have is the whole needing to have a buddy for your birdie topic. I am Tink's pal. She is always out of her cage when I am home and can keep an eye on her (she usually hangs out right beside or on me anyways). I have designed it so that wherever I might be in my apartment, she will have a safe place to hang out with me and have fun. We have our routine and in the evenings I preen her and she preens my eyebrows and eyelashes. She will sit on my shoulder, right up against my neck and snuggle up by my ear and nibble on my earrings.
I love Tink, and she loves me. We have even started to develop a language between us of clicks and whistles that we both understand. I should catch this on film since no one believes me... But it's true! My boyfriend has witnessed it!
I bought Tink because I needed a friend and she needed a loving home. I think, despite the fact that she doesn't have a flock of other birds around, she is one happy little chicken. So there. ^^