Oh I fully agree. The nameplate capacity for a single new line seems to be 5K/week ever since 2018 when Tesla decided it was more capital efficient to add a tent in Fremont, but build the 2nd 5K/wk line in China.
This happened so long ago people here either forgot about that decision or never knew it happened. Either way, the 5K/wk nameplate capacity of each line is based on 2 x 10 hrs shifts.
Bonus conjecture: The massive Model Y construction now underway in Shanghai will see 2 lines bultt for 5K/wk each, bringing GF3 production capacity to 15K/wk sometime in 2020.
Then that's a generous 25% margin on 5K/wk Models 3 @ $40K each, or $2,5B/yr gross margin from Model 3. Just the Model 3 line alone will buy 1 new Gigafactory / year
Add to that 10K/wk Models Y * 0.25 * $44K each, that's $5.5B gross margin / year coming online fully for FY2021. Yes, that's $8B / yr gross margin being generated at GF3/Shanghai by the start of FY2021.
That buids and pays for the new 'China Design Center', AND the Model 2 'World Car' factory. One year running it, and it pays for 2 more...
Its gonna git big, fast.
CH33RS!