I can't see why this new forum couldn't be created and then see if it's popular? What harm could it do? Such a forum would be very helpful, and this is a site for people on the spectrum after all, including parents with AS who could use the support and advice of others who are or have been in the same situation.
I know there are more parents with AS than the handful of people who've posted here, because I've talked to them, either by PM or in other threads, and I know that often they have specifically AS-related problems as parents. I hope they'll add their support.