I'd rather have more range and the TACC (which you get with the included AutoPilot) than SR+ range and AutoSteer and Auto Lane Change, to be honest. And that's from someone who has purchased FSD and thinks it's useful. I have the LR, but you basically get the P with dual motors in the UK too.
In the long run FSD might be worth it, but I doubt it's going to become that much more expensive than it is now...