As someone who posted a similar thread before, I understand OP's perspective. That said, it doesn't need to be free- and I understand the myriad responses that take issue with that. That said, I think there are a few ideas worth consideration:
1. If every 3 had AP , there would be fewer software variations/more standardization and the safety statistics would be a nice bonus (and marketing hook).
2. Item 1 could be accomplished through another "sale" - something in the $1,500-$2,000 range would win over a lot of hold-out (myself included). For those of us not planning to keep the car for 5+ years, AP looks like less of a value with every year that goes by (e.g. I have a 2018 and plan to trade it in 2022, so right now I'd only get 2 years of use out of AP. Since I'd likely trade the car to Tesla, I have trouble believing I'd recoop much of the cost since they can "flip the switch" for free).
3. With Item 2 in mind, I really like the idea of a subscription model (monthly would be fine - maybe $50ish). New revenue stream for them, flexibility for the owner.