Parent of two autistic children. What do I do when I am older?

I have a 4 year old and a 2 year old. It seems as if they will be fairly verbal, potty trained, but I have a hard time envisioning the future. What type of job will they hold? Will they be happy? How will others treat them? I love them so much.

I'm haunted everyday about their futures. What will happen to them after my husband and I are gone? I have a 10 month old that appears like she will be typical but I do not want to put this burden on her. She will have her own life to live. I am so stressed and scared.