I traded in my '16, and ordered in February. Truck built in May and sent to Purgatory. Ordered a 22 in June and it arrived a few weeks ago.
Not a day went by that I didn't question trading in my truck and (unexpectedly) going 6 months without a truck. Then it arrived and all those doubts evaporated.
Drop the AS (yours isn't a limited, is it?), it's not worth the wait. IMO
If you decide to wait, when the truck arrives, it will all be worth it. A BMW is nice, and a Porsche is really nice, but they are not going to give you the same feeling and experience.
Plus, we'd all really miss you around here!