In response to your question i have to say i dont know if GAD is curable yet because i have it and im still recovering. Being prone to anxiety is like being diabetic- you have to change your lifestyle and your attitude in accordance with it. If youre cured or not just depends on taking the necessary precautions. Its like do you stop drinking because you get a hangover, most people prefer the effect of the alcohol so they drink even though they get hungover. Some people who hate the hangover stop drinking. So changing your lifestyle and looking after yourself in all ways is preventative of the anxiety. All people get ill at one point or other, thinking of the positives of GAD- in response to a diagnosis you look after yourself through nutrition/excercise better and this can reduce your chances of cancer or other incredibly painful diseases later in life.
On the subject of meds- i have tried everything LITERALLY, antidepressants (about 5 different ones) anti-anxieties (buspirone, diazepam) mostly because i was not ready in my head to tackle the causes of my anxiety. I believe it takes time for you to get to know your body and mind and find the best methods of coping. Taking drugs didnt make me less anxious in the long term, only the short term which is obviously a NO CURE answer. I regard myself as lucky because i started having anxiety in response to the medication and i decided enough was enough. Psychotherapy didnt help me, it just made me more anxious.
Everyone is different, my cure is not your cure but if you keep searching you can find what works for you. Popping a pill may be fine for some people but it just seemed like a socially acceptable drug addiction to me. I had a CBT therapist who had suffered really badly with anxiety but she cured herself through meditation and CBT and general looking after herself which gave me hope to cure myself. I believe no therapist can do this for you, they can only give you the tools and the rest is up to your own determination to cure yourself.
There is no cure for anxiety because it is not a disease. Everyone feels anxiety its just that people with anxiety disorders feel too much. So therefore you learn to reduce your anxiety to a normal level and BANG! there you are, youre cured. Its hard to believe when youre new to anxiety but after a while you start to think "im fed up with this, im sick of popping pills, im sick of talking to people who dont understand what im going through, im going to cure myself"
And here i shall finish the rant!