Hello --
No personal experience with multiple "dys" issues, but I have a close friend who homeschools her children with dyslexia, dysgraphia, and ADD.
The children have made progress with lots and lots of hard work and an expensive do-at-home reading program. The mother is very busy and often very tired. The family plans to transition the children to public school in the 6th grade, at which point she will be able to re-enter the workforce.
If your DW has the strong desire and the stamina to homeschool, and if you have the financial resources, you might find your child makes more progress in less time. Homeschool doesn't have to be forever. The children can go back to school at any time if your life situation changes.
Really, only you and your family can know if homeschooling will work for you. My recommendation is to try some Saturday summer school at home this summer, after your son has a few weeks to wind down and de-school. See how that goes before anyone quits their job or makes a big commitment.
Best of luck!
Kitty
