Unfortunately, there is no way of telling what the future will bring, every child is different. My boy is 6 and non verbal and although it's been introduced, PECS or exchanging picture cards are still not something my child is able to do.
What keeps me positive, is that he is happy and can tell what he needs in his own ways. By body language or guiding me to what he wants. You learn to read your child and those who spend enough time with him will do, too. In the daily world, the majority of communication we use every day is non verbal, so spoken words are not everything.
What annoys me are those who ask me, when will your boy finally talk, he must not be getting the correct help. Whilst he is getting great help every day. It is important for people to know that you can guide your child, but you can't force them to talk. It is far more important that they find a way to communicate than it is to find a way to make them talk.
What has really helped me are the people who told I am doing the best I can, I'm a good mum and I'm allowed to find life difficult at times. That they can see I am raising a happy child and that their abilities are far more important than their disabilities. To focus on what my child can do not what he can't.
I try to stay positive and not to listen to horror stories about how difficult the future of non verbal autistic children can be. You will often hear stories of the two extremes, really negative ones or miracle stories, but there is so much more inbetween that we do not hear about. No one knows what the future will bring or how your child will develop. Over the years so many positive changes have been made to make autism better understood and to provide better lives for those who deal with autism. So I have faith that things will only continue to get better.
No one knows what is going to happen so rather than a prognosis, I take one day at the time. Worrying about the future in which we don't know what will happen and we can't do anything about will only put you down or drive you mad.