Wishful thinking perhaps, but I like the idea of a low cost (if not free - because, reality) basic autopilot either as a subscription or a minimal purchase price ($750?) and then opting into FSD for months when I have more driving/long road trips planned.
From what Elon has said the basic AP should be an option you can buy for $2k in the next month or so.
As far as FSD, I suspect it will be a minimum of a year subscription. And they said that over time it would cost significantly more than buying it outright and adding it to your loan/lease. So wild guess: $200/month. (And it would go up as features are added and the FSD purchase price increases.)