Tesla already has a big communication issue regarding autopilot 1.0. Assuming 2.0 is a big leap forward, can you imagine the communication nightmare and liability when they start showing off autopilot 2.0 that can do point-to-point full route driving including city streets with stop lights and stop signs? What are the odds that someone (who likely doesn't frequent these forums) gets into one of the existing 100k-200k autopilot 1.0 cars, mistakenly assumes their car will stop for a red light, and plows right into a bunch of children crossing the street? It's highly unlikely Tesla will refresh the exterior of the Model S/X again for at least 4 years so how will folks know or understand the difference between autopilot 1.0 and 2.0? Check the VIN and if > 150000 then it will stop at red lights but if < 150000 then it won't stop at red lights? For this reason, I'm gonna bet on retrofit not only being available for autopilot 1.0 cars but I predict it will actually be required in the sense that autopilot convenience features will be disabled after a certain date for all cars that don't have the new hardware. Just a guess of course.