quote from Tesla latest earnings call, at 04 min..

"Because we're really moving into a future that is based on autonomy and so if you're interested in buying a Model S and X, now would be the time to order it, because we expect to wind down S and X production in next quarter and basically stop production of Model S and X next quarter. We'll obviously continue to support the Model S and X programs for as long as people have the vehicles, but we're gonna take the Model S and X production space in our Fremont factory and convert that into an Optimus factory, which will... with the long-term goal of having 1 million units a year of Optimus robots in the current S/X space in Fremont."