I suspect this is to streamline production and logistics. A single variant for seating will vastly simplify both going forward, now that Tesla is producing both the S & X on a single line. 6-seater was obviously the most popular choice, Tesla obviously has margin to spare on an X.
In the larger view, this is also bullish for total Fremont production, since it implies more space and resources being reallocated to Model 3/Y production. Somehow, they plan to increase 3 prod. by 50% there (unknown timeline). This obviously requires a 2nd GA line with the same capacity as the 1st one, and it needs space.
Anybody familar with the factory layout? Can reallocating space from the former Model X line make enough room for another Model 3 line? Also watching the videos for signs of new 'tentage'...
Cheers!