*hugs*
I know that it must be heartbreaking to know that the life of one's child will be any more challenging than the challenging rat-race of life already is. However, there is so much triumph, so much beauty, and so much wonder beyond the challenges and beyond the pain. Some people with Asperger's become highly unhappy, but so do many people without Asperger's.
There are so many success stories out there about people with Asperger's and autism. Take Temple Grandin, for example, who was once non-verbal and who now is a world-renowned researcher and writer. Bill Gates is often believed to have Asperger's.
I can also give you a personal example, if that would be of any assistance to you. From the age of three until the end of third grade, I was in the Special Education program. I have been suicidal; I have lost friends that were almost like siblings, I have damaged relationships with my parents, and, occasionally, I self injure. But my life is so much more than my struggles. Now, I am a senior in high school, completely in regular education, that is in all honors and AP (Advanced Placement) classes. Out of a class of about 460 students, I am ranked in the top ten. As a toddler, I babbled more than I talked; now, I am in Advanced Choir and perform poetry. My poetry has been published in local and national anthologies. I even have friends who think that my quirks make me a wonderful person to be around.
Things may be difficult at times, as all lives are, but things can and will get so much better.
Be strong for him, and he will be so much stronger for you.