The advantage of being reasonably bright is if you can find his motivation he can probably develop copeing mechanisms.
My DS is slightly younger (15) also Autistic. He loves technology though so we're hoping some form of tech apprenticeship at 16. We do have one that I have everything crossed for.
When he was little we had a great psychologist momentarily who said that bright ASC children can learn but only if they have reason to want to.
One of the (many) things I worried about was him having adult independance. She said there's no reason that at 30 he couldn't have some form of independant living. What would be unlikely would be that he'd be ready at 18 to simultaneously leave school, access higher education/ employment, learn to drive and manage finances. All at the same time.
This has always resonated with me. So my expectations are he'll be at home for some years and we need to keep wobbling him to encourage his personal development and keep moving him towards that degree of independence whether it's semi supported living or just family supported living.
For DS, change needs to be managed a bit at a time. We find change is best managed by creating motivation for change.
We've started on using a mobile phone when things go wrong, watering plants for someone close (a relative) whilst they were on holiday for a nominal amount of money. We have let him open a bank account with his own debit card and basic online banking app so he can watch his monies grow. His motivation for earning money was to buy some peach paint (long irrelevant story). We created the motivation by stopping just handing him money and I point blank refused for my hard earnt cash to be spent on paint when his walls were a perfectly good colour (he could see the logic - it was hard to create this motivation as i'd still do anything for him). He got involved in the repainting of his room, i tried not to take over too much.
He understands the necessity to work to earn money to get a mortgage to get his own place (yes he's getting a little ahead of himself). So he's been open to weighing up different career choices and we've spent time looking at things online together - mainly his suggestions (some painful). He though about doctor but patients, hours, stress, uni years all made that undesirable. Paramedic but people and stress again an issue. Airline pilot - cost of training makes it impractical. He's talked about other jobs and looked at the salaries and they've not met his expectations for the sort of property he'd like to live in.
It's been hard to encourage but allow him to lead the conversation without saying not a chance. At 15 he can't walk two streets from home, cross at a pedestrian crossing, reliable use a phone, use the pavement when a vehicle obstructs it. Use toilets in public places like school. But, he is bright. With enough determination if he really wants something, I think it may just be possible.
He knows he wants to have a car. Currently he likes the little 2 seater smart cars. He wants to work fairly near to home. He'd like his home to have a spare bedroom so his sibblings can visit him and maybe a yard so he can have a tool shed. This motivation means he takes responsibility for the fact he needs to earn.
So after what is no doubt now a lengthy post....Does your son have any big motivations or can you create any?